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LIBRARY 

UNIVERSITY OF CALIFORNLA 
PA VIS 



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STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 



BULLETIN NO. 66-58 



Quality of Ground Waters 

in California 

1958 



EDMUND G. BROWN 

Governor 




November, 1960 



iFORMA 

HAR\T.Y O. BANKS 
Di. ector o£ Water Resources 



STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIMSION OF RESOURCES PLANNING 



BULLETIN NO. 66-58 



Quality of Ground Waters 

in California 

1958 



EDMUND G. BROWN 

Governor 




November, 1960 



LIBRARY 

yWlVERSITY OF CALIFORNIA 
DAVIS 



HARVEY O. BANKS 

Director of Water Resources 



TABIZ OF CONTENTS 

Page 

LETTER CF TRAJBMITTAL v 

ACKNOWLEDGMENTS vi 

ORGANIZATION, STATE EEPARTMENT OF WATER RESOURCES viii 

ORGANIZATION, CALIFCmNIA WATER COMMISSION ix 

SUMMARY OF CONDITIONS, 1958 1 

THE GROUND WATER QUALITI MONITORING PROGRAM 1 

QUALITT OF GROUND WATERS IN CALIFORNIA, 1958 6 

NORTH COASTAL REGION (No. 1) 

Staith River Plain (l-l)* 6 

Butte Valley (1-3) 7 

Shasta Valley (l-li) 8 

Scott River Valley (1-5) 9 

Mad River Valley (1-6) 9 

Eureka Plain (1-9) 10 

Eel River Valley (l-lO) 11 

Ukiah Valley (1-15) 12 

Sanel Valley (1-16) 12 

Alexander Valley (1-17) 13 

Santa Rosa Valley (1-18) ik 

SAN FRANCISCO BAT REGION (No. 2) 

Clayton Valley (2-5) 16 

Tgnacio Valley (2-6) 17 



♦ Ground water basin number; eacplamation on page four. 



Page 

Santa Clara Valley (2-9) 18 

East Bay Area 16 

South Bay Area 19 

Livermore Valley (2-10) 19 

CENTRAL COASTAL REGION (No. 3) 

Pajaro Valley (3-2) 21 

Salinas Valley (3-U) 22 

Carmel Valley (3-7) 23 

Santa Maria River Valley (3-12) 2k 

Cinyama Valley (3-13) 25 

LOS ANGELES REGION (No. h) 

Oxnard Plain Basin (U-U.Ol) 27 

West Coast Basin (U-11.02) 29 

Area of Sea-Water Intrusion 29 

Torrance Area 31 

Athens Area 31 

Central Coastal Plain Pressure Area and 

Los Angeles Forebay Area (ii-11.03 and U-ll.OU) 32 

Main San Gabriel Basin (li-13.01) 33 

CENTRAL VALLEY REGION (No. 5) 

Redding Basin (5-6) 35 

l%)per Lake Valley (5-13) 36 

Kelseyville Valley (5-l5) 37 

Sacraaento Valley (5-21) 38 

Tehama County * . . 38 

Glenn County 39 

ii 



Page 

Butte Coontj UO 

Colusa County Ill 

Sutter County Ii2 

Tuba County Ii3 

Yolo County Uh 

Sacramento County hh 

San Joaquin Valley (5-22) I;6 

San Joaquin County k6 

Stanislaus County hi 

Merced Coimty Ii9 

Madera County $0 

Fresno County $1 

Tulare County 53 

Kern County 5il 

LAHONTAN REGION (No. 6) 

Lower Mojave River Valley, Barstow to Terrao (6-liO) 56 

COLORADO RIVER BASIN REGION (No. 7) 

Coachella Valley (7-21) 58 

SANTA ANA REGION (No. 8) 

East Coastal Plain Pressure Area (8-1.01) 60 

Chino Basin (8-2.01) 61 

Bunker Hill Basin (8-2.06) 62 

SAN DIEGO REGION (No. 9) 

San Luis Rey Valley, Mission Basin (9-7.01) 65 



iii 



Page 

El Cajon Valley (9-l6) 6? 

Tia Juana Valley Basin (9-19) 68 

PLATES 
No. 

1 Monitored Areas, 1958 

2 Status of Sea-Water Intrusion, Santa Clara Valley, East Bay Area 

3 Status of Sea-Water Intrusion, Pajaro Valley 
h Status of Sea-Water Intrusion, Salinas Valley 

5 Status of Sea-Water Intrusion, Oxnard Plain Basin 

6 Statxis of Sea-Water Intrusion, West Coast Basin 

7 Status of Sea-Water Intrusion, East Coastal Plain Pressure Area 

APPENDIXES 
A Monitoring Area Information 
B Well Data 
C Water Quality 
D Radioassay of Groimd Water 



IT 



EDMUND a. BROWN 
HARVKY O. BANK* oovmnor addre.s reply to 



DimcToii 




p. o. aox ass Sacramento 2 

llaO N STREET HI CKORY 8-4711 



STATE OF CALIFORNIA 



SACRAMENTO 



November 28, I960 



Honorable Edmund G. Brown, Governor, and 
Members of the Legislatiore of the 
State of California 

State and Regional Water Pollution Control Boards 

Gentlemen: 

I have the honor to transmit herewith a report on the quality 
of ground waters in California during calendar year 1958. This is the 
fourth in a continuing series of reports on the ground water monitoring 
program conducted by the Department of Water Resources. 

Under this program, water samples from representative v;ells 
in ground water basins throughout the State are collected and analyzed, 
and an annual evaluation is made of ground water quality conditions. 

This report, for the period from January through December 1958, 
includes mineral and radiological analyses of ground waters from 53 moni- 
tored areas in California. The report on this program for 1959 is in 
preparation and is scheduled for ccmpletion during I960. 

Sincerely yours. 



pt^^. ^^ 



HARVH 0. BANKS 
Director 



ACKNOWLEDGMENTS 

The statewide ground water quality monitoring program, reported 
herein, comprises the yearly collection of about 1,U00 ground water samples 
froB 53 areas located throughout the State. This extensive coverage is made 
possible through the cooperation of many agencies and persons. 

The United States Geological Svtrvey, Ground Water and Quality of 
Water Branches, furnished considerable technical and financial assistance. 
Many of the analyses presented herein were made by the United States Geologi- 
cal Survey Quality of Water Branch at its Sacramento laboratory, under pro- 
visions of a continuing cooperative agreement with the Department of Water 
Resources. 

Valuable field assistance and cooperation of the following agencies 
and persons is gratefully acknowledged: 

County Agencies 

Alameda County Flood Control and Water Conservation District 

Butte County Farm Advisor 

Colusa County Farm Advisor 

Del Norte County Farm Advisor 

Glenn County Farm Advisor 

Humboldt County Farm Advisor 

Kern County Farm Advisor 

Kings County Farm Advisor 

Los Angeles County Flood Control District 

Madera Coimty Farm Advisor 

Mendocino Coimty Farm Advisor 

Monterey County Flood Control and Water Conservation District 

Orange County Air and Water Pollution Control District 

vi 



Sacramento County Farm Advisor 

San Bernardino County Flood Control and Water Conservation District 

Siskiyou County Farm Advisor 

Sonoma Cotrnty Farm Advisor 

Stanislaus County Farm Advisor 

Sutter County Farm Advisor 

Tehama County Farm Advisor 

Tulare County Farm Advisor 

Yolo County Farm Advisor 

Tuba County Farm Advisor 

Public Agencies 

Central California Irrigation District 

Merced Irrigation District 

San Joaquin Local Health District 

Turlock Irrigation District 

Private Organizations 

California Water and Telephone Company, National City 



vii 



ORGANIZATION 

STATE lEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

Harvey 0. Banks Director of Water Resources 

Ralph M. Brody Deputy Director of Water Resources 

James F. Wright Deputy Director of Water Resources 

William L. Berry Chief, Division of Resources Planning 

Irvin M. Ingerson Chief, Engineering Services Branch 

The activity under which this report has been 
prepared is directed by 

Meyer Kramsky Principal Hydraulic Engineer 

The activities in Northern California are 
under the supervision of 

Willard R. Slater Supervising Ifydraulic Engineer 

!nie activities in Southern California are 
under the direction of 

John R. Teerink District Engineer 

and the siqjeirvision of 
David B. Willets Supervising hydraulic Engineer 

This report was prepared by 

Arthur J. Inerfield Senior Civil Engineer 

Robert F. Clawson Senior I^draulic Engineer 

Eldon E. Rinehart Associate Hydrographer 

assisted by 

Felix W. Cartier Civil Engineering Associate 

Janes C. Mosley Assistant H(ydraulic Engineer 

Eugene C. Ramstedt Assistant Civil Engineer 

Leonard I. Prager Assistant Ifydraulic Engineer 

Chester Lao Assistant Engineering Geologist 

Charles E. Labat Junior Civil Engineer 

Ralph M. Toshizuka Engineering Aid II 

James J. Morgester Engineering Aid II 

Norma J. Rcxnine Intermediate Typist-Clerk 

Paul L. Barnes Chief, Division of Administration 

Porter A. Towner Chief Counsel 

Isabel C. Nessler Coordinator of Reports 



viii 



ORGANIZATION 
CALIFORNIA WATER CCMilSSION 



Jaroes K. Carr, Chairman, Sacramento 

William H. Jennings, Vice Chairman, La Mesa 

John W. Bryant, Riverside John P. Bunker, Gustine 

Ira J. Chrisman, Visalia George C. Fleharty, Redding 

John J. King, Petaluma Kenneth Q. Volk, Los Angeles 

Marion R. Walker, Vent lira 



George B. Gleason 
Chief Engineer 



William M. Carah 
Executive Secretary 



IX 



SUMMARY OF CONDITIONS 
1958 



While degradation of the qviality of ground water from such sources 
as industrial and urban wastes and use and reuse of waters for irrigation has 
continued to increase, the major threat to ground water quality in California 
In 1958 was sea-water intrusion. In many of the State's coastal basins, 
where the draft on ground water has exceeded the safe yield, ground water 
levels have been so lowered as to permit landward encroachment of salt water. 
Anong the areas showing such degradation are: Santa Clara Valley; Pajaro 
Valley; Salinas Valley; Oxnard Plain Basin; West Coast Basin; East Coastal 
Plain; San Luis Rey Valley, Mission Basin; and Tia Juana Valley Basin. In 
other basins, both coastal and inland, significant increases or decreases in 
mineral concentration in individual wells were noted. These changes, however, 
appear to be local in extent and do not necessarily indicate basin-wide water 
quality trends. Except in coastal areas subject to intrusion, or in individual 
wells situated near specific sources of degradation, ground water quality did 
not change significantly from that found in 1957. 

THE GROUND WATER QUALITY MONITORING PROGRAM 

The use of ground water in California has increased tremendously 
since the turn of the century. The necessary water development to supply 
a rapidly expanding economy, together with the shortage of suitable surface 
storage sites, has so stimulated development of ground water that approxi- 
mately one-half of the State's present seasonal water requirements, of about 
25,000,000 acre-feet, are supplied from underground storage. As each succeed- 
ing surface water storage unit becomes more costly to develop, the use of 
undergroxmd reservoirs as a source of supply becomes more attractive. 



-1- 



The present widespread dependence upon ground water, together with 
the need for more intensive utilization of undergrovind storage to meet in- 
creased future water needs, requires constant vigilance coupled with remedial 
action, where necessary, to assure that the quality of ground water remains 
svtL table for all intended uses. In view of the extensive occurrence of ground 
water and its relatively slow rate of movement, the determination of ground 
water qriality and detection of changes therein requires reliable long-term 
obsenration and records. To help meet this need, a statewide program of ob- 
servation and compilation of records of gi^und water quality was initiated by 
the Department of Water Resources in 1953. 

Presented in this report are the analyses and evaluations of water 
samples collected dviring 1958. Data for previous periods are included in 
the following reports: California Department of Public Works, Division of 
Water Resources, Water Quality Investigations, Report No. lU, "Ground Water 
Quality Monitoring Program in California", Progress Report 1953-195Uj and 
California Department of Water Resources, Division of Resources Planning, 
Bulletins No. 66, "Quality of Ground Waters in California, 1955-1956", and 
"Quality of Ground Waters in California, 1957". 

The ground water quality monitoring program is authorized by Section 

229 of the Water Code, which directs that the department shall: 

•*. . . investigate conditions of the quality of all waters 
within the State, including saline waters, coastal and inland, 
as related to all sources of pollution of whatever natiu-e and 
shall report thereon to the Legislature and to the appropriate 
regional water pollution control board annually, and may recom- 
mend any steps which might be taken to improve or protect the 
quality of such waters." 

The objectives of the program are: 

(1) To provide information on the prevailing mineral quality of 
ground waters. 

(2) To provide a reliable continuing check on quality of ground waters. 

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(3) To secure data relating to significant changes in mineral 

quality, to evaluate the causes for these changes and to iden- 
tify and delineate the areas affected by such changes. 

(li) To notify the appropriate regulatory agencies regarding the 
findings of the program. 

(5) To provide the required data on ground water quality for the 
purpose of water development planning and construction. 

During 1958, water samples were collected and analyzed from 53 
ground water basins or portions of basins in California. Requests and sugges- 
tions from regional water pollution control boards and other interested water 
agencies were considered in selecting areas for monitoring. 

Monitored areas fall into the following broad categories: areas 
where water qxiality problems are known to exist; areas where extensive use 
is made of the ground water resources and where there are potential water 
quality problems; and areas in which ground water is not presently used exten- 
sively, but where it is desirable to secure data on native water qviality con- 
ditions in anticipation of future development. 

Frequency of sampling depends largely on the nature and imminence 
of the quality problem. Only a minimum number of wells necessary to delimit 
accurately the problem or to evaluate ground water conditions are included 
in the monitoring network. The selection of individual wells is governed to 
a large extent by the availability of well logs. Sufficient information is 
desirable for each well such as depth, aquifers encountered, and depths of 
perforations to assure that data obtained are \iseful. Wells are added to or 
dropised from the network according to changing ground water conditions in 
an area. For example, a well showing prominent effects of sea-water intnision 
is generally removed from productive use and, in many instances, sampling 



-3- 



becomes impracticable. Accordingly, another well is substituted, if possible. 

In 1958, the program was e:)q)anded to include radiological deter- 
minations in addition to the usual mineral analyses in all of the monitored 
areas. This provides background information for the evaluation of the effects 
of the ever- increasing uses of radioactive materials. 

The information presented in the text for each monitored area in- 
cludes a brief description of the area, evaluation of water qtiality problems, 
the number of wells sampled in 1958 and an evaluation of the data collected 
during the reporting period. 

To facilitate geographical orientation, the areas are grouped by 
water pollution control regions, the boundaries of which, in general, coincide 
with those of the major drainage basins of the State. These regional bound- 
aries and the areas included in this monitoring program are shown on Plate 1. 

The region and basin numbers in this report are based on a decimal 
system in the form x-xxirxx. The number to the left of the dash refers to the 
region of a water pollution control board. On the right of the dash, the first 
digit or digits refer to the basin, valley or area. Digits to the right of 
the decimal, if any, refer to the sub-basin number. These numbers are used 
to identify the monitored areas in the text, in the data tables, and on Plate 1. 
A "monitored area" is defined as that portion of a ground water basin which 
lies within the limits of an established network of monitored wells. It does 
not necessarily include the entire ground water basin. 

Reference should be made to the appendixes for more detailed infor- 
mation than is given in the main text. A tabulation showing the number of 
wells in each monitored area and the sampling times, as well as a summary of 
information pertaining to occurrence, development, and use of ground water 
for each of the monitored areas is presented in Appendix A. The location of 
the monitored wells and other pertinent data thereon, together with an explanation 

-h- 



of the well numbering system, are presented in Appendix B. Grovind water 
analyses obtained during 19$8 are presented in Appendix C by monitored areas. 
Also included in Appendix C are discussions of laboratory methods and procedures 
and criteria for appraising the suitability of water for various uses. The 
results of radiological analyses of wells tested in 1958 as well as a discussion 
of procedures and interpretation are presented in Appendix D. 



-5- 



QUALiry OF GROUND WATERS IN CALIFORNIA, 1958 
NORTH COASTAL REGION (No. 1) 

The North Coastal Region extends approximately 270 miles from north 
to south, ranges in width from 180 miles at the Oregon boimdary to about 30 
miles in the southern portion, and encompasses an area of about 19,000 square 
miles. It comprises all of the basins draining into the Pacific Ocean from 
the California-Oregon state line southerly to the northern boundary of Lagun- 
itas Creek drainage area in Marin County ( Plate 1 ) . 

Nineteen ground water basins in the North Coastal Region have been 
identified. As of 1958, eleven of these basins were included in the monitoring 
program. These are Smith River Plain, Butte Valley, Shasta Valley, Scott 
River Valley, Mad River Valley, Eureka Plain, Eel River Valley, Ukiah Valley, 
Sanel Valley, Alexander Valley, and Santa Rosa Valley. 

Smith River Plain (1-1) 

Smith River Plain is located adjacent to the coast in the north- 
western portion of Del Norte County. The plain extends approximately 18 miles 
north to south, varies in width from about four to seven miles, and encompasses 
an area of about 70 square miles. It is .the largest alluvial area in the 
county (Appendix A). 

The ground waters of Smith River Plain are generally a magnesium 
bicarbonate type of excellent mineral quality. However, there are several 
potential sources of ground water degradation. Among these are a threat of 
sea-water intnision along the coast, encroachment of brackish water from 
Lake Earl, and possible local contamination from septic tanks in the vicinity 
of Crescent City. Monitoring of the area was initiated in 1956 to maintain 
a check on these possible sources of degradation. In 1958 samples were collected 
from 17 wells. 

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Although the 1958 analyses showed slight increases in total dissolved 
solids in some of the monitored wells, the concentrations generally remained 
low. Boron concentrations increased in a few wells during the period from 
December 1957 to October 1958. The greatest increase, 0.0 to 1.1 parts per 
million (ppm), occ\irred in well 16N/1W-15C1, located approximately two miles 
northeast of Crescent City (Appendix B). There were few changes in other 
mineral constituents during this period. Total dissolved solids ranged from 
iUi to 28U ppm in samples collected in Smith River Plain during 1958 (Appendix G), 
Sodium comprised from h to 5l percent of base constituents, and total hardness 
varied from lit to 190 ppm. Gross radioactivity in the monitored wells ranged 
from 0.17 to i|.5l micromicrocuries per liter (>jinc/l), well below the provi- 
sional recommended limit for drinking water of 100 njic/l, si:iggested by the 
United States Bureau of Standards. Radiological analyses of ground water are 
presented in Appendix D. 

Butte Valley (1-3) 

Butte Valley lies in the northeastern part of Siskiyou Covmty, 
about 30 miles south of the Oregon border and east of the Cascade Range. 
The valley floor is an irregularly-shaped area comprising approximately 130 
sqviare miles. 

Ground water in Butte Valley is generally a bicarbonate type, with 
moderate mineral concentrations, although locally some wells produce water 
high in mineral content. These highly mineralized ground waters probably orig- 
inate in buried playa deposits which occur in the east side of the valley. 
A monitoring program was established in Butte Valley in 1957. 

Analyses of samples collected from 11 wells in July and August 1958, 
compared with those collected in August 1957, showed slight boron increases 
in five of the monitored wells. The largest increase, 0.0 to 0.5 ppm. 



-7- 



occurred in well U6N/2W-25R2, located 2.5 miles southwest of Macdoel. These 
increases are probably due to infiltration of localized waters containing 
high boron concentrations. The highly mineralized water from well ii7N/lW-23Hl, 
located in the eastern part of the valley, did not change significantly. Total 
dissolved solids in this well were 2,7UU ppm in 1958 and 2,670 ppm in 1957. 
Excliiding well U7N/1W-23H1, total dissolved solids did not exceed 36ii ppm, and 
total hardness was 136 ppm or less. Sodium ranged from 17 to 75 percent of 
base constituents. Gross radioactivity ranged from 1.36 to 3U.39 MMc/l in the 
sampled wells. 

Shasta Valley (l-U) 

Shasta Valley is located between the Klamath Mountains and the Cas- 
cade Range in the central part of Siskiyou County. The valley is nearly oval 
in shape, has a north-south length of about 30 miles, a maximum east-west width 
of about 15 miles, and includes an area of approximately 250 square miles. 

The ground waters in Shasta Valley are generally of excellent mineral 
quality. However, waters high in sodium, boron, and potassium, probably due 
to the migration of poor quality waters known to be present in certain geolo- 
gic formations in the area, are found in some wells in the northeastern portion 
of the valley. The presence of these highly mineralized waters and the possi- 
bility that they might degrade the good quality waters prompted the establish- 
ment of a monitoring program in this area in 1957. 

In 1958, samples were collected from eight wells in Shasta Valley. 
Comparison of analyses of samples taken from six of these wells in 1958 with 
those of 195? showed significant boron increases in two wells. Boron in well 
liiiN/5W-32Fl, located four miles east of Montague, increased from 0.57 to 1.3 
ppm; and in well U3N/6W-21R1, located two miles northwest of Gazelle, from 
0.0 to 0.7 ppm. There were no other significant changes in concentration of 



-8- 



mineral constituents in ground water samples collected in this area in 19$8. 
Total hardness ranged from 101 to 369 ppm, with three wells showing greater 
than 200 ppm. Total dissolved solids ranged from l8U to 72[i ppm, with only 
one well exceeding the upper limit for class 1 irrigation water. Gross radio- 
activity in the sampled wells did not exceed 9.22 mc/l. 

Scott River Valley (1-5) 

Scott River Valley is located in the western portion of Siskiyou 
County, and lies about 28 miles south of the California-Oregon boundary. The 
valley has a north-south length of 22 miles, a maximum width of about 10 miles, 
and comprises an area of approximately 80 square miles. 

The ground waters of Scott River Valley are generally of excellent 
mineral quality and are suitable for most beneficial uses, although most are 
moderately hard. In 19$7, a monitoring network was established to detect 
any change in water quality. 

The analyses of ground water samples collected from four wells during 
1958 show only slight changes in mineral constituents. Small amounts of boron 
were found in three wells which were boron- free in 1957. The greatest boron 
concentration, 0.8 ppm, occurred in well UiiN/9W-3[i.Rl, located near Fort Jones. 
Total dissolved solids did not exceed 286 ppm, chlorides were less than 11 ppm, 
and total hardness was moderate. In 1958, the gross radioactivity did not 
exceed 3.5h w^/l in the monitoring wells. 

Mad River Valley (1-8) 

Mad River Valley lies north of Humboldt Bay in Humboldt County, and 
is bordered on the north and east by the Coast Range, and on the west by the 
Pacific Ocean. The monitored portion of the valley is approximately rectangu- 
lar in shape, averages about six miles in a north-south direction, and extends 
inland from the coast an average of about three miles. 






Ground waters in Mad River Valley are characteristically a mag- 
nesium bicarbonate type suitable for most beneficial uses. However, there are 
indications that sea-water intrusion exists in the coastal segment of this 
valley. A monitoring program was established in 1957 to observe the extent of 
sea-water intrusion and the quality of groxond waters in the basin. 

In 1958, analyses were made of samples collected from 10 wells in 
Mad River Valley. Comparison of these analyses with those of 1957 shows that 
chlorides have continued to increase in well 6N/1W-1P1, located near the mouth 
of Mad River in the area of sea-water intrusion. Chlorides in this well were 
1,U60 ppm in February 1957; 2,520 ppm in December 1957; and 2,736 ppm in 
August 1958. Total dissolved solids in the monitoring wells ranged from 
111 to 5,iiU8 ppm; chlorides, from 7 to 2,736 ppm; boron from 0.0 to 1.7 ppm; 
and total hardness, from ij3 to 1,125 ppm. Percent sodiim ranged from J.h to 
77. The highest mineral concentrations were found in wells located adjacent 
to the coast. The maximum gross radioactivity was 9.59 Ui^ c/l. 

Eureka Plain (1-9) 

Eureka Plain is located on Humboldt and Areata Bays between the 
Eel and Mad River Valleys in Humboldt County. It is approximately 6 miles 
wide, 12 miles long, and includes about 70 square miles. Elk River is the 
principal stream in the basin. 

Except for water from a few wells near the coast, the chemical 
quality of ground water in Eureka Plain is good. Most waters from the alluv- 
ium are calcium-magnesium bicarbonate in character and are moderately hard, 
while waters from the dune sand near the coast are sodium chloride in character. 

The monitoring program for this area was established in 1958 with 
the collection of samples from two wells. Analyses showed high percent sodium, 
75, and moderately high boron concentration, 0.72 ppm, in well 5N/1E-18Q1, 



-10- 



located only a few hundred feet from Areata Bay. Well $N/1E-20Q1, located 
approximately one and one-half miles farther inland, contained water of ex- 
cellent quality. In this well, total dissolved solids were 238 ppm; chlorides, 
35 ppm; and percent sodiian, 37. The maximum gross radioactivity obseirved 
during 1958 was 7.90 \nc/l. 

Eel River Valley (l-lO) 

Eel River Valley is the largest valley fill area in Humboldt 
County. The monitored portion is about 8 miles wide at the coast, extends 
inland about 12 miles to the confluence of the Eel and Van Duzen Rivers, and 
includes an area of about 75 sqiiare miles. 

The ground waters of this area are generally hard, but are suitable 
for most uses. A seaward hydraulic gradient exists over the entire basin 
most of the year. However, heavy pumping during a short period in the summer 
season lowers the water table below sea level in an area adjacent to the coast. 
When this condition exists, saline water from the tidal portion of Eel River 
enters and degrades fresh-water bearing deposits. To maintain continuous 
observation on the q\iality of ground water in this area, a monitoring program 
was established in 1956. 

In 1958, samples were collected from 12 wells in Eel River Valley. 
Two of these wells (3N/2W-13J1 and 3N/2W-27G1), located in the tidal portion 
of the river, showed evidence of sea-water intrusion. Since 1957, these two 
wells have shown increases in total dissolved solids from 8Ii2 to 2,90ii ppm 
and from 69U to 3,hh6 ppm, respectively. Chlorides in these wells also in- 
creased, rising from 390 to 1,502 ppm and from 300 to l,6l5 ppm, respectively. 
The remaining monitoring wells showed no significant changes in mineral con- 
centrations. Water in those wells located outside the area of sea-water in- 
tiTision, although moderately to very hard, was of excellent mineral quality. 



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In the wells tested in 1958, the gross radioactivity did not exceed 11.60 
Mtic/l. 

Ukiah Valley (l-lg) 

Ukiah Valley comprises about 65 square miles of alluvial fill area 
along the Riissian River in the east-central portion of Mendocino Coiinty. The 
valley is approximately 22 miles in length, and varies in width up to 5 miles. 

Highly mineralized ground waters occur along the eastern edge of 
the valley, probably originating from mineralized springs in the area. In 
order to detect quality changes in this valley a monitoring network was es- 
tablished in 1953. 

Analyses of samples taken from 11 wells in 1958 show only minor 
changes in mineral constituents in all but one of the monitored wells. The 
exception is well 17N/12W-18A1, located in the northern portion of the monitored 
area. The boron concentration in this well increased from h5 ppm in 1957 to 
76 ppm in 1958. Due to the poor quality, this well is no longer in use. The 
source of this degradation is believed to be waters migrating from an under- 
lying and adjacent geologic formation known to contain waters with high boron 
concentrations. Well 1Un/12W-26K1, located at the southern end of the valley, 
contained 3.0 ppm boron which also exceeds the limit recommended for irrigation 
use. 

Percent sodium in the monitoring wells ranged from 13 to 86, with 
only one well (17N/12W-18A1) containing greater than 37 percent sodium. 
Total hardness ranged from 82 to 2U6 ppm. The maximum gross radioactivity 
was found to be 10.99 nnc/l. 

Sanel Valley (l-l6) 

Sanel Valley is an irregularly shaped area located in the south- 
eastern portion of Mendocino County. It is traversed by the Russian River in 

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a north-south direction and comprises an area of about 11.5 square miles. 

Grovind waters in Sanel Valley are characteristically magnesium- 
calcium bicarbonate in type, and are generally suitable for most beneficial 
uses. However, ground waters in localized areas contain high boron concen- 
trations. Due to the presence of this high boron, a monitoring program was 
established in the area in 1956. 

A comparison of mineral analyses of samples collected from five 
wells in 1958 with those collected in 1957 indicated no significant changes 
in natiire or concentration of mineral constituents. In 1958, the total dis- 
solved solids ranged between 19I4 and 32li ppm. The highest boron concentra- 
tion was 1.1 ppm in well I3N/IIW-I8BI, located approximately 1.5 miles north 
of Hopland. Boron in the other monitoring wells was 0.38 ppm or less. Sodium 
did not exceed 15 percent of the base constituents in any of the water sam- 
pled. The highest observed gross radioactivity was 6. 61 ^nic/l. 

Alexander Valley (1-17) 

Alexander Valley lies along the Russian River in the north-central 
portion of Sonoma County. The monitored area has a length of approximately 
Ih miles, an average width of about 1.5 miles, and comprises about 20 square 
miles . 

Ground water in Alexander Valley is generally of low mineral con- 
tent and suitable for most beneficial uses; however, waters high in boron 
occur in local areas throughout the valley. It is believed these boron con- 
centrations are derived from connate water or from juvenile water rising 
along faults. Disposal of winery waste water into unlined ponds is a poten- 
tial source of degradation of ground water in the northern portion of Alexander 
Valley. To detect quality changes, a monitoring program was established in 
this area in 1957. 



■13- 



Samples were collected frcwi eight wells in Alexander Valley during 
July 1958. Comparison with those collected in Janviary 1957, showed that 
boron concentration decreased from 1.8 to 0.7 ppm in well 10N/9W-18R1, located 
about 0.5 mile northeast of Geyserville, and increased from 0.06 to 0.80 ppm 
in well 11N/10W-33G1, located approximately five miles northwest of Geyserville. 
There were no other significant changes in mineral concentrations. The maxi- 
raim total dissolved solids concentration was LdiU ppm. The highest boron con- 
centration was I.l5 ppm, with four wells yielding waters containing boron in 
excess of 0.5 ppm. Percent sodium ranged from 9 to 92 with only one well 
showing greater than 60 percent, the upper limit for class 1 irrigation water. 
Gross radioactivity did not exceed U.75 jijic/l. 

Santa Rosa Valley (l-l8) 

Santa Rosa Valley is located in the south-central portion of Sonoma 
County. The area monitored comprises about 150 square miles, has a length 
of about 25 miles, and ranges in width from about U to 12 miles. Bennett, Rin- 
con, and Kenwood Valleys, which lie east of Santa Rosa Valley, are also included 
in this monitored area. 

The quality of ground water in Santa Rosa Valley is generally satis- 
factory for most uses. However, high concentrations of boron occur locally, 
and sodium percentages in certain wells are in excess of those recommended 
for irrigation use. A monitoring network was established in this area during 

1957. 

Comparison of analyses of samples taken from 21 wells in 1958 with 
those of 1957 showed marked boron increases in three wells: 0.01 to 0.76 ppm 
in well 5N/9W-3F1, located one mile southeast of Bloomfieldj 0.09 to 0.8U ppm 
in well 7N/8W-18Q1, located approximately three miles west of Santa Rosa; and 
0.23 to 1.00 ppm in well 7N/7W-29D1, located approximately two miles southeast 



-Ih- 



of Santa Rosa. Percent sodivmi also increased in wells 5N/9W-3F1 and 7N/8W-18Q1 
from 36 to 77 percent and from UO to 68 percent, respectively. The sources 
of these increases may be deep-lying poor quality groxind waters rising along 
faults. Total dissolved solids did not exceed 6lii ppm and the maximum boron 
concentration was 1.00 ppm. Percent sodium ranged from 19 to 77, with four 
wells showing greater than 60 percent sodium. Gross radioactivity did not 
exceed 11.09 ^pc/l. 



-15- 



SAN FRANCISCO BAY REUlOrj (Mo. 2) 

San Francisco Bay Region includes all of the basins which drain 
into San Francisco Bay, San Pablo Bay, and that portion of Suisun Bay below 
Antioch. It includes parts of Marin, Sonoma, Napa, Solano, Contra Costa, 
Alameda, Santa Clara and San Mateo Counties, and all of San Francisco County. 
The region extends about 125 miles from north to south, averages li5 miles in 
an east-west direction and comprises an area of about U,i;00 square miles 
(Plate 1). 

Within the boundaries of the San Francisco Bay Region, 11 major 
ground water basins have been identified. As of 1958, only four of these 
basins, Clayton, Ygnacio, Santa Clara, and Livermore Valleys, were included 
in the ground water quality monitoring program. For purposes of discussing 
ground water quality, Santa Clara Valley has been divided into two areas. 
East Baor and South Bay. 

Clayton Valley (2-5) 

Clayton Valley is located in north central Contra Costa County and 
extends from the foot of Mt. Diablo to Suisvm Bay. It has a length of about 
10 miles, a maximum width of about 3 miles, and an area of about 20 square 
miles . 

The ground waters in Clayton Valley are predominantly a magnesium- 
calcium bicarbonate type, very hard, but otherwise of good to excellent mineral 
quality. A ground water qviality monitoring program was established in this 
area in 1957. 

Although no serious water quality problems are presently apparent 
in Clayton Valley, boron concentrations in two of the nine wells sampled in 
1958 were high enough to suggest a potential problem. Well 2N/1W-32Q1, 



-16- 



located two miles east of Concord, and well 2N/2W-26B1, located two miles north 
o^ Concord, contained boron concentrations of 0.65 and 0.70 ppm, respectively. 
Boron in the latter well had decreased from 1.2 ppm in August 1957. A nitrate 
concentration of 50 ppm was found in water from well 2N/1W-31D1, adjacent to 
Concord. This exceeds the limit for drinking water of hh ppm, recommended by 
the California State Department of Public Health. Four other wells showed ni- 
trate concentrations between 30 and 33 ppm. Possible sources of these high 
nitrates are septic tank effluent and/or fertilizers. Total dissolved solids 
ranged from U6l to 1,110 ppm, with only one well showing greater than 700 ppm. 
The maximum observed gross radioactivity was 5.13 >i»*c/l« 

Ygnacio Valley (2-6) 

Ygnacio Valley is located in northern Contra Costa County and is sep- 
arated from Clayton Valley on the east by the Concord fault which forms a hydro- 
logic barrier between the two ground water basins. The monitored area is 
about ten miles long, varies in width from one to six miles, and includes an 
area of about 20 square miles. 

The groxind waters of Ygnacio Valley are varied in type, with sodium or 
calcium the predominant cations. Quality is generally poor, usually class 2 or 
3 for irrigation. This condition prompted the inclusion of Ygnacio Valley in 
the monitoring program in 1957. Samples were taken from eight wells in 1958. 
Total dissolved solids ranged from 5ii8 to 2,270 ppm, with only one well showing 
less than 700 ppm; chlorides, from 87 to 663 ppm with only two wells showing less 
than 175 ppm; boron, from 0.16 to 6.7 ppm, with two wells showing less than 0.5 
ppn; and total hardness from 2kh to 1,300 ppm. Percent sodium ranged from 18 to 
72 with only one well exceeding 60 ppm, the upper limit for class 1 irrigation 
water. Nitrates in well 2N/2W-36E1, near Concord, were 118 ppm. In samples col- 
lected during 1958, gross radioactivity did not exceed 5.57 jijic/l. 



■17- 



Santa Clara Valley (2-9) 

East Bay Area . The East Bay Area of Santa Clara Valley is located 
in Alameda County between San Francisco Bay and the foothills of the Diablo 
Range. The monitored portion comprises about ihO square miles of alluvial 
land, which extends northerly from the Alameda-Santa Clara county line a dis- 
tance of about liO miles and varies in width from 2 to 11 miles. 

The ground water reservoir formed in alluvial material which has 
been deposited by Alameda Creek between the town of Niles and San Francisco 
Bay, is termed the "Niles cone". Because of prolonged overuse of ground water 
supplies in this portion of the monitored area, the water table has been low- 
ered below sea level for many years allowing saline bay waters to invade 
shallow water-producing gravels. In recent years, saline waters have also 
been detected in deeper water-bearing zones, which are separated from the 
shallower zones by extensive clay layers. 

To maintain surveillance on the quality of ground water in these 
areas subject to sea-water intrusion, a program was established in 1953 to 
monitor both the upper and lower aquifers. During 1958, samples were col- 
lected from 23 wells in this area. 

During the period of record, 1953-1958, chloride concentrations in 
a few wells have shown considerable variations. For example, well US/lW-30C2, 
located directly west of Centerville, contained chlorides of 112 ppm in Augxist 
1951^5 261 ppra in October 1955; 1,0U6 ppm in June 1956; and 559 ppm in January 
1958. Fluctuations in the chloride content of individual wells in this area 
are not uncommon, however, and do not necessarily indicate trends. The area 
of sea-water intrusion has increased from about 660 acres in 1953 to approxi- 
mately 2,630 acres in 1958. Plate 2 shows the approximate extent of intnision 
in the Centerville area during 1953, 1957 and 1958. 



-18- 



Significant ranges of mineral constituents in samples collected 
during 1958 from the 23 East Bay wells are as follows: total dissolved solids, 
from 220 to 1,2U0 ppm; chlorides, from 23 to 1,600 ppm; and boron, from 0.l8 
to 0.97 ppm. Nitrates of 70 and 68 ppm were found in samples from wells 
2S/3W-3UA2 and hS/lW-33G3, respectively. The first well is located near San 
Leandro and the second approximately two miles southeast of Centerville. 

South Bay Area . The South Bay Area of Santa Clara Valley included 
in the monitoring program lies within Santa Clara County and extends from 
Palo Alto southerly to San Jose. The monitored area is approximately 20 miles 
long, varies in width from $ to 12 miles, and comprises about 1$0 square miles. 

Sea-water intrusion has existed in the tidelands area adjacent to 
San Francisco Bay for many years. This prompted the inclusion of the South 
Bay Area in the monitoring program in 1953. 

Comparison of analyses of samples from 10 wells in 1958 with those 
of 1957 or earlier showed increases in total dissolved solids or specific con- 
ductance in all but one of the 10 wells. The greatest increase occurred in 
well 6S/1W-16A1, located approximately six miles west of San Jose, where total 
dissolved solids increased from 259 ppm in August 1957* to 5Ul ppm in October 
1958. Chloride concentrations of 215 ppm and 186 ppm in wells 5S/3W-35G1 
and 6S/3W-1B1, respectively, both located in the Palo Alto area, indicate 
possible saline degradation. Total dissolved solids did not exceed 7Ul ppm. 
Percent sodium ranged from 20 to 73- The maximum observed gross radioactivity 
was 5.73 vmc/l. 

Livermore Valley (2-10) 

Most of Livermore Valley is located in the eastern portion of Alameda 
County, although a minor area extends into Contra Costa County. The monitored 
area has an east-west length of about lU miles, varies in width from 3 to 6 

-19- 



miles, and encompasses an area of about 50 square miles. 

A monitoring program was established in 1953 due to the dependence 
of the area on ground water supplies, and the presence in the ground water of 
boron and nitrates in excessive quantities. 

Analyses of samples collected from 31 wells in 1958 showed no basin- 
wide changes in ground water qiiality. However, the boron concentration in 
well 2S/2E-27C1, located about three miles north of Livermore, decreased from 
27 to 11.1 ppm between October 1957 and May 1958. Chlorides in this well 
increased from 1,110 to 1,370 ppm between May and October 1958. Well 3S/2E-12M1, 
located approximately three miles east of Livermore, showed a boron concentra- 
tion of 9.1 ppm. Six wells contained nitrate concentrations in excess of 30 
ppm, the highest being 113 ppm in well 3S/2E-26J1, located about four miles 
southeast of Livermore. Gross radioactivity did not exceed 15.90 wc/l. 



-20- 



CENTRAL COASTAL REGION (No. 3) 

The Central Coastal Region extends from the southern boimdary of 
Pescadero Creek Basin in San Mateo County to the northeastern boundary of Rincon 
Creek Basin in Ventura County. The region is characterized by narrow coastal 
strips and coastal valleys with moderate slopes toward the ocean, backed by 
mountain ranges paralleling the coast. It averages 50 miles in width and en- 
compasses an area of approximately 11,000 square miles (Plate 1). 

Valley areas in the Central Coastal Region, except for a few isolated 
sections, receive moderate rainfall, and depend largely on ground water as 
a soiirce of supply. Approximately 90 percent of the water requirements of this 
region are supplied from groxmd water sources. Nineteen ground water basins, 
eighteen of which are utilized intensively to supply irrigation water, have 
been identified in the Central Coastal Region. Five of these ground water 
basins have been included in the program. These are Pajaro, Salinas, Carmel, 
Santa Maria River, and Ci^^ama Valleys. 

Pajaro Valley (3-2) 

Pajaro Valley comprises an irregvilarly shaped area of about 75 
square miles lying in the Pajaro River drainage basin below Chittenden Pass. 

Ground waters in Pajaro Valley occur in three distinct zones, desig- 
nated the shallow, intermediate, and deep zones. The shallow zone extends 
from land surface to a depth of about 100 feet. The intermediate zone lies 
between 100 and 300 feet and the deep zone occurs below UOO feet. Shallow 
zone ground water is often of poor qxiality. Ground water in the intermediate 
zone is generally suitable for most irrigation uses, and is the main source 
of supply. The limited data available concerning water quality in the deep 
zone indicate it to be of excellent mineral quality. Sea-water intrusion 
into intermediate zone ground water adjacent to Monterey Bay prompted the 

-21- 



inclusion of Pajaro Valley in the monitoring program in 1953- 

In general, ground waters in Pajaro Valley not affected by sea- 
water intrusion, are of good to excellent mineral quality. The predominant 
type is calcium-magnesium bicarbonate of low to moderate total dissolved solids, 
chlorides, and boron. The presence of chlorides in significant amounts is 
limited to small areas adjacent to Monterey Bay. 

Comparison of analyses of samples taken from 31 wells in 1958 with 
those of 1957 showed no appreciable changes in ground water quality. Total 
dissolved solids in sampled wells ranged from 20U to 1,89U ppm; and chlorides, 
from 17 to 796 ppm, with six wells showing chlorides in excess of 175 ppm, 
the upper chloride limit for class 1 irrigation water. The limit of sea-water 
intrusion in Pajaro Valley is shown on Plate 3. Gross radioactivity did not 
exceed 8.58 WJc/l. 

Salinas Valley (3-U) 

The monitored portion of Salinas Valley is approximately liO miles 
in length, varies in width from 2 to 10 miles, and contains about 300 square 
miles of highly productive irrigated and dry-farmed land. 

Ground waters in Salinas Valley occur principally in three aqui- 
fers. These consist of an upper unconfined aquifer and two lower confined 
aquifers. The lower aquifers are known as the l80-foot aquifer and the UOO- 
foot aquifer. A serious water quality problem exists, caused by the intrusion 
of sea water into overdrawn fresh-water aquifers in the portion of Salinas 
Valley adjacent to Monterey Bay. Two miles inland from the bay shore, ground 
water in the upper aquifer has been degraded to such an extent by saline water 
that it is either unfit for agricultural use, or is near the upper limit of 
quality suitable for such use. Ground waters in the portions of Salinas Vall^ 
not subject to sea-water intrusion, while hard, are of good to excellent 



-22- 



mineral quality. 

A monitoring program was established in Salinas Valley in 1953 to 
observe the status of sea-water intrusion into the l80-foot and hOO-foot 
aquifers, and to detect significant changes. 

Samples collected from 55 wells in this area during 1958 showed in- 
creases in chlorides in a few wells located adjacent to the tidal portion of 
Salinas River. A slight inland advance of sea-water intrusion in both the 
180 and the hOO-foot aquifers has occurred since 1957 (Plate U). Chlorides in 
well 13S/2E-30L1, which draws from the l80-foot aquifer, increased from 166 
ppn in July 1957, to 232 ppm in June 1958. This well has shown a progressive 
increase in chlorides since August 1951;, at which time the chloride concen- 
tration was 103 ppm. The largest increase in chlorides occurred in well 
Ih3/2E-5R2, where chlorides increased from 122 to 26Ii ppm between July 195? 
and June 1958. Eleven of the 55 monitored wells showed chloride concentra- 
tions in excess of 180 ppm. The range in chlorides was from 21 ppm in a well 
located approximately three miles east of Salinas, to 566 ppm in a well located 
approximately one mile southwest of Castroville. Gross radioactivity did not 
exceed 12.73 Wic/l. 

Carmel Valley (3-7) 

Carmel Valley is located about three miles south of the City of 
Monterey, and is a long, alluvium-filled valley, extending eastward from the 
coast a distance of about 23 miles. However, only the coastal portion of 
Carmel Valley, which might be susceptible to sea-water intinision, is included 
in the monitoring program. The area monitored is about one mile in width, and 
extends from the coast about three miles inland. 

Ground waters of Carmel Valley are a calcium bicarbonate type and, 
with the exception of hardness and iron, are of excellent mineral quality. 



-23- 



A monitoring program was established in this area in 1953 to detect sea-water 
intrusion. Data from the sampling program indicate that there has been no 
significant variation in mineral characteristics of grottnd water during the 
period of record. There has been no evidence of sea-water intnosion in the 
monitored wells to date. 

Analyses of samples collected from seven wells in 1958 showed no 
significant changes in mineral constituents during the period of record. 
Chlorides ranged from U6 to 1^2 ppm. Total dissolved solids were below 700 
ppm in all wells except one, which contained 86h ppm. Boron concentrations 
and percent sodium were well below recommended limits. Hardness, however, 
was high, ranging from 215 to I426 ppm. Iron concentrations in wells l6S/lW-13Q2 
and 13L1, in the western portion of the monitored area, were 2.0 and 0.57 ppm, 
respectively, above the limiting value (0.3 ppm) recommended for drinking 
water by the United States Public Health Service. The maximum gross radio- 
activity observed was 11. 06 nnc/l. 

Santa Maria River Valley (3-12) 

The Santa Maria River Valley occupies parts of San Luis Obispo and 
Santa Barbara Counties. The ground water basin extends inland from the ocean 
along the Santa Maria River, a distance of 28 miles, ranges up to 9 miles in 
width and includes about I80 square miles. 

Ground waters of this valley are a calcium-magnesium sulfate type. 
The waters are low in boron and percent sodium and are suitable for irrigation 
of most crops. They are, however, very hard and sulfates greatly exceed the 
recommended limit of 250 ppm for drinking water. 

The monitoring program in Santa Maria River Valley, which was es- 
tablished in 1953, is primarily concerned with the detection of degradation 
in quality of ground water that might result from oil field operations or sea- 
water intrusion. While most of the oil field brine is conveyed to the ocean 

-21;- 



by pipe line, there is a possibility that ground water quality could be de- 
graded by accidental spillage of oil field brines or percolation from sxanps. 
In addition, should ground water levels near the ocean be depressed below 
sea level, the producing ground water aquifers would be threatened with sea- 
water intrusion. 

Although a few of the wells have shown gradual degradation, with 
increases in chlorides, sulfates, and total dissolved solids, there has been 
no significant basin-wide variation in mineral quality during the period 1953- 
1958. Analyses of 26 samples obtained from 20 wells in 1958 show a wide range 
in total dissolved solids content, from 326 to 2,lU8 ppm. Percent sodium 
ranged from 18 to 66, with only one of the wells exceeding Uij percent sodium. 
Total radioactivity determinations were made for 9 of the 20 minotired wells 
in Santa Maria River Valley in 1958. The values range from 0.30 to 2.30 n^c/l. 

CTyama Valley (3-13) 

Cuyama Valley occupies portions of Santa Barbara, Ventura, Kern, 
and San Luis Obispo Counties. The ground water basin extends along the Cuyama 
River, a distance of 35 miles, varies from 1 to I4 miles in width, and comprises 
about 125 square miles. 

The character of the ground water in Cuyama Valley is generally 
calcium-magnesium sulfate. Although the water is not well suited for domestic 
purposes, due to extreme hardness and high sulfate concentrations, it is low 
in boron and percent sodium and is suitable for irrigation of a variety of 
crops. Historically, the ground waters in this basin have contained low to 
moderate chloride concentrations. Possible degradation of ground water qual- 
ity by oil industry wastes and mineralized springs, principally in the northern 
and northwestern part of the basin, prompted the establishment of a monitoring 
program in 1953. 



-25- 



Comparison of analyses of samples obtained from lli wells in 1958 
with those of the five preceding years indicates that, with the following ex- 
ceptions, only minor variations in mineral qxiality have occurred in this period, 
From June 1956 to December 1958, chlorides in well 10N/25W-23E1, located in 
the northeast portion of Cuyama Valley, increased from 78 to 278 ppm. Sodium 
also increased, from IMS to 239 Ppm in this well during the same period. 
Analyses of water from well 10N/26W-23P1, located about 1.5 miles south of 
Cyyama River in the north-central portion of the valley, exhibit similar 
variations during this period. Historically, the ground waters in this valley 
have contained low to moderate chloride concentrations, ranging up to about 
100 ppm. The high chlorides in wells 10N/25W-23E1 and 10N/26W-23P1 may indi- 
cate degradation by oil well brines. The analysis of a sample taken from well 
10N/25W-30F1, located in the central part of Cuyama Valley about 0.5 mile 
south of the river, reveals a nitrate concentration of Ul5 ppn. The reason 
for this extremely high concentration has not as yet been determined. Total 
dissolved solids in the monitoring wells ranged from 705 to 3,557 ppmj 
sulfates, from 3hh to 2,398 ppm; and total hardness, from 225 to 2,156 ppm. 
Total radioactivity of samples taken from 10 of the lii monitoring wells during 
1958 was 3.20 fipc/l or less. 



■26- 



LOS ANGELES REGION (No. U) 

The Los Angeles Region extends from the southeastern boundary of 
the watershed of Rincon Creek in Ventura County to the Los Angeles-Orange 
County boundary, a distance of approximately 100 miles. It extends from the 
Pacific Ocean inland to the drainage divide, an average distance of 50 miles, 
and occupies an area of approximately It, 260 square miles (Plate 1). The region 
is characterized by broad coastal plains and inland valleys, backed by mountain- 
ous topography. The Ventura, Santa Clara, Los Angeles, and San Gabriel Rivers 
are the principal streams of this region. 

The ground water supply of the region has been extensively developed. 
In many areas, the safe yields of the basins have been exceeded. Supplemental 
water supplies are imported from Mono and Owens Valleys and the Colorado River. 

Sixteen ground water basins and hO sub-basins have been identified 
in the Los Angeles Region. The following basins or sub-basins have been in- 
cluded in the monitoring program: Oxnard Plain Basin, West Coast Basin, Central 
Coastal Plain Pressure Area and Los Angeles Forebay Area, and Main San Gabriel 
Basin. 

Oxnard Plain Basin (h-U.Ol) 

The Oxnard Plain Basin is located in the coastal portion of Ventura 
County. It is a flat, gently sloping plain, roughly triangular in shape, 
comprising approximately 73 square miles. This area fronts on the Pacific 
Ocean for a distance of 16 miles and extends inland a maximum distance of 
about 8 miles. 

The main water-bearing zones in Oxnard Plain Basin are called, in 
order of depth, the Oxnard, the Mugu, and the Fox Canyon aquifers, all of which 
are open to the sea. The intrusion of sea water into the Oxnard aquifer at 
Port Hueneme and the Mugu and Oxnard aquifers near Point Mugu has been evident 

-27- 



for several years. At Port Hueneme, the sea-water front has moved inland into 
the Oxnard aquifer for distances of more than one and one-half miles from the 
shore line. The intrusion is caused by excessive pimipage of ground water, re- 
sulting in lowered water levels and the creation of a landward hydraulic 
gradient. The monitoring program in Oxnard Plain Basin was initiated in 1953. 
Wells in the present program are situated in and around the area of sea-water 
intinision. 

Ground waters in Oxnard Plain Basin are predominantly calcium-sodium 
sulfate in character and are, where not affected by sea-water intrusion, suit- 
able for irrigation of most crops, except those sensitive to boron. The 
character shifts to sodium chloride in the areas of intrusion. The waters 
are hard and marginal for domestic use because of their high sulfate content. 

Comparison of analyses of 36 samples taken from 19 wells in Oxnard 
Plain Basin in 1958 with those of the five preceding years indicates that sig- 
nificant variations in mineral quality have occxirred in the intruded area. 
The lines of equal chloride concentration, shown on Plate 5, indicate that 
sea-water intrusion is advancing in two areas, one located near Port Hueneme 
and the other near Mugu Lagoon. 

In the Port Hueneme area, a significant advance of sea water into 
fresh water aquifers has occurred between 1957 and 1958. In the area between 
Hueneme Road and Pleasant Valley Road, the lines of intrusion marked by the 
500 ppm isochlor advanced eastward apparently as far as 1,700 feet. In the 
area just west of Ventura Road, the intrusion moved northward about 1,000 feet. 
The maximum landward advance of sea-water encroachment shown by the 500 ppm 
isochlor was 1.8 miles in 1958, as compared with 1.5 miles in 1957. 

In the vicinity of Mugu Lagoon, the extent of sea-water intrusion 
cannot be accurately determined due to the absence of water wells and essential 
analyses data. While the 500 ppm isochlor is indicated for 1958 at approximately 

-28- 



the same position as shovm in 1957, a gradual increase in the chloride content 
of the waters of some of the intruded wells is noted. 

Wells sampled in Oxnard Plain Basin in 1958 show the following 
ranges for mineral constituents: total dissolved solids from 6l5 to 13,996 
ppm; chlorides from 37 to 6,808 ppm; sulfates from 193 to l,l55 ppm; and boron 
from 0.0 to 2.80 ppm. Total hardness ranged from 230 to h,3(>0 ppm. No sig- 
nificant changes in total dissolved solids, total hardness, chlorides, or 
general character of the ground water are apparent outside the areas of in- 
trusion. The level of total radioactivity of samples from 13 of the monitor- 
ing wells did not exceed 19 Wc/l. 

West Coast Basin (U-11.02) 

West Coast Basin is located in a portion of the coastal plain in 
the southwestern part of Los Angeles County adjacent to Santa Monica Bay. It 
is approximately 19 miles long and averages 9 miles in width. In general, 
its surface is a gently rolling, lightly eroded plain, with an area of about 
160 square miles. 

The principal aquifers underlying West Coast Basin comprise the 
Silverado water-bearing zone and the "UOO-foot gravel" in the San Pedro forma- 
tion. A condition of overdraft exists in the basin, resulting in sea-water 
intrusion extending more than one mile inland along the Santa Monica Bay 
coast into the Silverado water bearing zone. Industrial waste discharges 
have affected wells in the Torrance and Athens areas. Monitoring programs 
for each of these areas are currently in effect to detect and to determine 
the extent of ground water impairment. These areas are treated in detail in 
the discussions which follow. 

Area of Sea-Water Intrusion . The area monitored for sea-water in- 
trusion occupies about 15 square miles of the coastal plain along Santa Monica 



-29- 



Bay in the western part of West Coast Basin. The area extends from about 
Culver Boulevard southward to the vicinity of the City of Redondo Beach. 

The mineral character of the ground waters in this area which are 
not influenced by sea-water intrusion is sodium bicarbonate to calcium bicar- 
bonate. In the intruded area, the character changes to sodium chloride. 

Water from well I4S/1UW-I7D3, located 0.7 mile inland from the ocean 
showed a chloride ion concentration of U,880 ppm in May 19^8. Test holes 
drilled by the Los Angeles County Flood Control District in the southern por- 
tion of the sea-water intrusion front near Redondo Beach indicate the existence 
of high chloride waters in that area. Sea water is, in general, continuing 
to advance landward in most portions of the intrusion front in this basin. 

During 19^8, 11 samples were obtained from 8 monitoring wells in 
this area. The analyses of these samples show the following ranges in min- 
eral constituents: total dissolved solids from khl to 8,500 ppmj and chlorides 
from 83 to U,880 ppm. 

Early in 1958 the chloride content of some of the wells influenced 
by sea-water intrusion showed a slight decrease. Later in the year signifi- 
cant increases were noted in waters from some of these wells. In well 3S/l5W-12Gl, 
located in the City of El Segundo about 1.7 miles from the ocean, chlorides 
increased from 28$ ppm in October 1956, to l,8l40 ppm in May 1958. Total dis- 
solved solids in this well increased from 80U to U,U57 ppm dviring the same 
period. Between March 1953, and March 1958, well 3S/l5W-12H2, located about 
1.9 miles from the ocean, showed an increase in chlorides from 112 to 310 ppm. 
Total dissolved solids also increased from 270 to 1,170 ppm in this well during 
this period. No similar increases were noted in analyses of water from the 
other monitored wells. 

The status of sea-water intrusion in West Coast Basin is shown on 
Plate 6. 

-30- 



Torrance Area . The Torrance Area is located in the interior portion 
of West Coast Basin. The area is bounded by 190th Street on the north. Main 
Street on the east. Pacific Coast Highway on the south, and Santa Monica Bay 
on the west, and comprises about 30 square miles. Wells chosen for monitoring 
are situated in and around the City of Torrance. 

Wastes from the oil and other heavy industries discharged to surface 
svmps and drainage channels in and near the City of Torrance have seriously 
affected groxind water qxiality in the upper aquifers. Impairment of water 
quality in the lower water-bearing zones could occur by interchange of water 
through improperly constructed or abandoned wells or by hydraulic continuity 
between aquifers. 

The monitoring program in Torrance Area was instituted in accord- 
ance with a recommendation of the Los Angeles Regional Water Pollution Con- 
trol Board (No. h) following a survey of industrial waste discharges directed 
bj the Board in 1953 and 195U. 

During 19138, 16 samples were obtained from 8 monitoring wells in 
the Torrance area. Waters from approximately one-half of the monitored wells 
have shown little or no change in mineral character or concentration. Data 
for the remainder of the wells indicate fluctuations in mineral concentrations 
but do not indicate a trend. Total dissolved solids ranged from 320 to 1,257 
ppm, and total hardness ranged from 70 to 576 ppm in samples taken in 1958. 
Tests for total radioactivity were made on samples from four of the eight mon- 
itoring wells in 1958. In these samples total radioactivity was quite low, 
not exceeding U.7 WJc/l. 

Athens Area . The Athens Area occupies about 50 square miles in the 
interior portion of the South Coastal Plain. It extends approximately from 
Florence Avenue north of the City of Inglewood to 190th Street on the south, 
and from Sepulveda Boulevard on the west to Alameda Boulevard on the east. 

-31- 



The character of the ground water varies from calcium bicarbonate 
to calcium-sodium bicarbonate- chloride. The water in the deep water-bearing 
zones is moderately hard to very hard, but is suitable for prevailing bene- 
ficial uses. 

Ground water monitoring in the Athens Area was initiated in 1953 
following a survey of industrial waste disposal which was conducted in this 
area vmder the direction of the Los Angeles Regional Water Pollution Control 
Board. Wells chosen for monitoring are grouped in the vicinity of the City 
of Gardena. They have been selected to detect deterioration of ground water 
qxiality resulting from past and present oil well, oil refinery, and other in- 
dustrial wastes discharged to surface channels and sumps. 

Ten samples were collected from six wells in this area during 1958. 
Well 3S/13W-31F1, located near Laguna Dominguez, and producing from a serai- 
perched water body, yielded water of marginal quality. Chlorides in this well 
were 3kh ppm in March 1958. In general, the quality of water from most of 
the wells sampled did not change significantly between 1957 and 1958. No 
radiological analyses were made for wells in this area during 1958. 

Central Coastal Plain Pressure Area and Los Angeles 
Forebay Area (U-11.03 and Ij-ll.OU) 

Central Coastal Plain Pressure Area and Los Angeles Forebay Area 
are sub-basins of the Coastal Plain, Los Angeles County. They extend north- 
west-southeast about 22 miles and average about 12 miles in width. The moni- 
tored area occupies about 30 square miles, includes portions of both the Cen- 
tral Coastal Plain Pressirre Area and the Los Angeles Forebay Area, and is 
centered in the vicinity of the City of Huntington Park. 

Groxind water in this area is very hard. It ranges in character 
from calciimi bicarbonate to calcium-sodium bicarbonate-sulfate. Hydrocarbon 
tastes and odors have been noted in well waters in this area. 

-32- 



The monitoring program in Central Coastal Plain Pressure and Los 
Angeles Forebay area was established in 1953 to observe the duration of pol- 
luting effects from past industrial waste discharges. 

Comparison of analyses of eight samples taken from five monitoring 
wells in 1958 with those of the five previous years reveals little change in 
concentration of mineral constituents. Chlorides did not exceed 62 ppm, and 
total hardness ranged from 200 to 335 ppm. The highest total radioactivity in 
samples taken from the monitored wells in 1958 was 5.8 n^c/l. 

Main San Gabriel Basin (U-13.01) 

Main San Gabriel Basin occi;?)ies an area of approximately 115 square 
miles lying along the base of the San Gabriel Mountains in eastern Los Angeles 
County. The valley slopes gently from the San Gabriel Mountains southward 
about 9 miles to the Merced and Puente Hills. 

Ground waters of Main San Gabriel Basin are predominantly calcium 
bicarbonate in character. Althoijgh the waters are moderately hard to very 
hard, they are satisfactory for present beneficial uses. In recent years, 
rapid changes from agricultural land use to residential and industrial devel- 
opment has caused a large increase in the quantity of sewage and industrial 
wastes in this area. A lag in providing waste disposal facilities may cause 
water quality problems. 

A monitoring program was established in this area in 1953 to detect 
any water quality changes which might be attributable to the disposal of 
large quantities of sewage and industrial wastes. 

CoB^arison of analyses of 16 samples obtained from 10 wells in 1958 
with those of the 5 preceding years shows that minor variations in mineral 
quality have occurred. A trend of increase in mineral concentrations is 
indicated in ground water throughout the basin; however, this increase is slight. 



-33- 



Samples from well 1S/1CW-19N1, located near an unlined flood control 
channel which conveyed Colorado River water imtil late in 1957, showed a 
gradual increase in chlorides and sulfates between 1953 and 1957, followed 
by a slight decrease in 1958. The analyses indicate that channel seepage 
has affected the ground water near this well. The nitrate content in well 
1S/11W-2G1, located in Azusa near the San Gabriel River, increased from Ul 
to 73 ppm between December 1957, and November 1958. The reason for the increase 
is not known. Gross radioactivity for the seven monitored wells tested for 
radioactivity in 1958 did not exceed 3.3 wc/l. 



-3ii- 



CENTRAL VALLEY IlEGION (No. 5) 

The Central Valley Region averages 120 miles in width and is more 
than 500 miles in length. It extends from the California-Oregon line south- 
ward to the Tehachapi Mountains, and from the Coast Range on the west to the 
Sierra Nevada on the east (Plate 1). The region comprises a drainage area of 
approximately 59,000 sauare miles, and includes nearly Ixh percent of the valley 
and mesa lands of the State. 

Two major valleys, the San Joaquin and the Sacramento, are located 
in this region. These valleys contain the largest bodies of usable ground 
water in the State. The presence of numerous potential sources of water 
quality impairment requires that constant vigilance be maintained to assure 
the continued usefulness of this important source of water supply. 

Of 29 ground water basins identified in this region. Redding Basin, 
Upper Lake Valley, Kelseyville Valley, and almost all of the Sacramento and 
San Joaquin Valleys have thus far been included in the monitoring program. 
For convenience, the discussion and data for the Sacramento and San Joaquin 
Valleys are presented in this report by counties. 

Redding Basin (5-6) 

Redding Basin lies in the south central portion of Shasta County. 
The monitored area includes primarily the Cow Creek, Stillwater, Anderson, 
and Cottonwood Valleys. Its maximum dimensions are approximately 21 miles 
north to south, and 22 miles east to west; it comprises an area of about 
280 square miles. 

Groimd waters in Redding Basin are generally of excellent mineral 
quality, magnesium-calcium or magnesium-sodium bicarbonate in type. Total 
dissolved solids are generally less than 200 ppm. Moderately high sodium 
percentages occur in limited areas. Redding Basin was included in the 

-35- 



monitoring program in 1957. 

Samples were collected from 2? wells in Redding Basin during 19$8. 
The analyses show that total dissolved solids did not exceed 366 ppm and 
chlorides were 98 ppm or less. Boron ranged from to 2.23 ppm with only 
one well containing more than 0.57 Ppm. The waters were soft to slightly 
hard, the total hardness not exceeding 178 ppm. Percent sodium ranged from 
15 to 78, with three wells having greater than 60 percent sodium. The high- 
est gross radioactivity in the sampled wells was 10.83 ^^Jlc/l. 

Upper Lake Valley (5-13) 

Upper Lake Valley, which borders on and lies north of Clear Lake 
in Lake County, extends about seven miles north from the shore line of Clear 
Lake, and includes an area of about 16 square miles. 

The grovind waters of Upper Lake Valley are generally excellent in 
quality, although boron is present in excessive amounts in a few of the wells 
in the western and southern portions of the valley. The need to detect any 
migration of the high boron waters into other wells prompted the establish- 
ment of a monitoring program in the area in 1953. 

Boron concentrations in 12 of the 13 monitoring wells did not ex- 
ceed O.ii ppm in 1958. However, the boron concentration in well 15N/10W-10E1, 
located in the western portion of the valley, was 70 ppm. This well contained 
the highest total dissolved solids, 1,290 ppm, chlorides, [i56 ppm, and per- 
cent sodium, 85. This well, 112 feet deep, is not perforated in the alluvium, 
but draws water from an underlying older consolidated formation which typically 
contains poor quality water. Although this well produces water which is not 
representative of that now found in the alluvium, it is included in the moni- 
toring program because its poor qiiality waters are a potential source of de- 
gradation of surrounding good quality waters. 



-36- 



With the exception of well 15N/10V;-10E1, ground waters sampled 
in Upper Lake Valley during 1958 were of good to excellent mineral quality. 
Total dissolved solids in the remaining wells ranged from 69 to 1,0U0 ppm and 
chlorides from 2.7 to 12? ppm. Percent sodium did not exceed 38. The gross 
radioactivity was quite low in the monitored wells, ranging from 1.9 to 5.59 
jiMc/l. 

Kelseyville Valley (5-15) 

Kelseyville Valley is a gently rolling plain in Lake County. It 
is bordered by Clear Lake on the north, extends about seven miles in a north- 
south direction, and encompasses an area of approximately 30 square miles. 

Ground waters in Kelseyville Valley are magnesium bicarbonate in 
type and are slightly to moderately hard. Except for the presence of high 
concentrations of boron in the eastern and northern portions of the valley, 
the grottnd waters are generally very good in quality. In order to detect any 
degradation of ground waters in those portions of the valley adjacent to the 
areas of high boron, a monitoring program was established in Kelseyville 
Valley in 1953. 

Analyses of samples taken from nine wells during 1958 showed the 
following results: total dissolved solids ranged between 178 and 669 ppm. 
Chlorides did not exceed 27 ppm. The highest concentration of boron was 
0.71 ppm in well 13N/9W-12M1, located in the northeast part of the valley. 
This was an increase from the 0.3U ppm boron found in this well during 1957. 
Two other wells, located west of Kelseyville, showed boron concentrations in 
excess of 0.5 Ppm, the upper limit recommended for boron-sensitive crops. 
Gross radioactivity of samples collected from wells in Kelseyville Valley 
during 1958 ranged from 0.17 to 6.77 \i\c/l. 



■37- 



Sacramento Valley (5-21) 

The Sacramento Valley floor area comprises about 5,000 square miles. 
The area includes that portion of the Central Valley which extends generally 
northward from the Cosumnes River to the vicinity of Red Bluff. It is bordered 
on the east by the Sierra Nevada and on the west by the Coast Range. The 
ground water storage capacity of the Sacramento Valley, between the depths of 
20 and 200 feet below land surface, is about 30,000,000 acre-feet. 

Almost all of the Sacramento Valley is now included in the ground 
water quality monitoring program. Sutter Coiinty, Sacramento County, and a 
portion of Yolo County have been reported previously; Butte, Colusa, Glenn, 
Tehama, and Yuba Coimties, and the portion of Yolo County not previously 
reported are included in this report. 

Tehama County . The monitored area in Tehama Coxinty is bounded on 
the south by Glenn and Butte Counties, extends north a distance of about 30 
miles, and varies in width from 6 to 18 miles. 

Ground waters in Tehama County are generally of excellent mineral 
quality, bicarbonate in type, with calcium the predominant cation. However, 
calcium is seldom present in concentrations greater than 50 percent of the 
total cations. Although boron concentrations are usually quite low, there is 
evidence of high boron concentrations in ground waters to the north and east 
of the monitored area. 

A monitoring program was initiated in Tehama County in 1957 to 
provide essential ground water quality data and to detect any migration of 
the ciforementioned high boron waters. 

During 1958, samples were collected from 2U wells in Tehama County. 
Total dissolved solids in these samples ranged between 111; and i|2h ppm; 
chlorides did not exceed U6 ppm, and the highest boron concentration was 



-38- 



0.53 ppni, which was found in well 26N/2W-1[iF1, located in the east central 
edge of the area. The sodium percentage in this well was 8I4, the highest 
found in the area. The second highest sodium percentage was 5$ percent. 
Total hardness ranged between 17 and 282 ppm, with 19 of the 2i] wells yield- 
ing waters with total hardness less than 150 ppm. Little change in mineral 
concentrations or characteristics since 1957 was detected in any of the wells. 
Gross radioactivity in the monitored wells did not exceed 10. 36 HMc/l 
during 1958. 

Glenn County . The monitored portion of Glenn County includes only 
the valley floor area lying generally between the Sacramento River on the 
east and the nonwater-bearing rocks of the northern Coast Range on the west. 
It is boiinded on the north by Tehama County and on the south by Colusa County. 
It extends about 25 miles north to south and 15 miles east to west. 

Ground waters of Glenn County are bicarbonate in type, and generally 
of excellent mineral quality. Chloride and boron content are quite lov;, total 
dissolved solids are generally less than Ii70 ppm, and the average total hard- 
ness is about 200 ppm. Of four natiu'al gas fields in the county, only one, 
Ord Bend Field, produces a significant amount of poor quality waste water. 
This waste consists of about 2 gpm of highly saline water (13,700 to 15,U00 
ppm total dissolved solids) which is wasted directly to the land surface. 

Because of the importance of groiind water to the economy of Glenn 
County, together with the lack of water quality data, a monitoring program 
was established in this area in 1957. 

Comparison of analyses of samples collected from 22 wells in Glenn 
County during 1958 with those of 1957 showed little change in mineral constit- 
uents. The greatest change noted occurred in well 18N/IiW-2F1, located in 
the southwestern part of the monitored area, in which chlorides increased 



'39- 



from 5U to 98 ppm. During 1958, gross radioactivity did not exceed 5.70 
Ulic/l in wells tested in Glenn County. 

Butte County . The monitored portion of Butte County includes only 
the valley floor area. It extends from Tehama County on the north to Sutter 
County on the south, and is bounded generally by the Sacramento River on the 
west and the foothills of the Sierra Nevada on the east. The monitored area 
is approximately UO miles in length north to south, and varies in width from 
about 10 to 20 miles. 

Ground waters of Butte County are bicarbonate in type and are gen- 
erally very good in mineral quality. Total dissolved solids are usually quite 
low and vary between 100 and UOO ppm. Chloride and boron content is also low. 
Sodium is generally less than 25 percent of base constituents. There are, 
however, individual wells wherein nitrate content and sodium percentages are 
quite high. Ground waters in Butte Co\mty are generally soft, although a 
few wells yield moderately hard waters. 

There are little historic data available regarding ground water 
quality in Butte County. This lack of data, together with the importance of 
ground water to the economy of Butte County, prompted its inclusion in the 
ground water quality monitoring program in 1957- 

A comparison of analyses of samples collected from 23 wells in 1958 
with those taken in 1957 reveals few significant changes. One of the most 
notable of these occurred in well 22N/1E-9M1, located about h miles north 
of Chico, where the total dissolved solids increased from li57 ppm in 1957 
to 669 ppm in 1958. The nitrate content in this well increased from 50 
to 77 ppm, and hardness from 357 to 1:20 ppm. Nitrate content in well 
21N/2E-30C1, located in the east central part of the monitored area, decreased 
from 109 ppm in 1957 to 65 ppm in 1958. Gross radioactivity in wells tested 



-UO- 



in Butte County during 1958 was very low, the highest count being 7.99 ^Mc/l. 

Colusa County . The monitored area in Colusa Covinty includes most 
of the valley floor area. It is bounded on the east by Butte Creek and the 
Sacramento River, and on the west by the nonwater-bearing rocks of the Coast 
Range. The area extends from Glenn County on the north, to Yolo County on 
the south; it is about 32 miles north to south and ranges between 15 and 20 
miles east to west. 

The ground waters of Colusa County are quite variable, both as to 
mineral characteristics and to the concentrations of the principal constit- 
uents. The Quality ranges from excellent to poor. Ground waters high in 
chlorides and sodium percentages are found scattered throughout the area. 
Ground waters in the area are generally slightly to moderately hard, although 
a few wells have yielded extremely hard water. 

Due to the increasing importance of ground water to the economy of 
the county, and the expected increase in ground water utilization, a monitoring 
program was initiated d;iring 1957 in Colusa County with the sampling of about 
30 wells located throughout the valley floor area. 

During July 1958, samples were taken from 27 wells in this area. 
Chlorides in these samples varied between 5.5 and 29U ppm. Boron ranged from 
0.01 to 2.2 ppm, with the highest value in well No. 13N/2VJ-29R1, which is 
located in the southwest corner of the monitored area about five miles south- 
west of nrbuckle. Nitrates ranged between 0.2 and 16 ppm, with the exception 
of well 15n/2W-32R1, located six miles north of Arbuckle, which yielded water 
containing a nitrate concentration of [i2 ppm. This was an increase from 19 
ppm in 1957. Sodium percentage, which exceeded 60 percent in four of the mon- 
itored wells, ranged between 13 and 82 percent. The maximum gross radioactivity 
found in the monitored wells during 1958 was 9-3 jiyc/l. 



-I4I- 



Sutter County. The monitored portion of Sutter County is bounded 
generally by the Feather River on the east and the Sacramento River on the 
west; these rivers generally comprise the eastern and western boundaries, 
respectively, of Sutter County. The county is situated in the Sacramento 
Valley proper and is, for the most part, underlain by water-bearing deposits. 
Almost all of the county is included in the ground water quality monitoring 
program. 

Ground waters in Sutter County are generally bicarbonate in type, 
and are moderately hard. Although magnesium is the dominant cation, it is 
usually present in only slightly greater concentrations than calcium or 
sodium. An area which yields groiind waters containing excessive amounts of 
sodium chloride extends from about three miles south of Yuba City southward 
a distance of 11 miles, and thence southwestward across the Sutter I^-Pass 
to Robbins. The so\irce of this sodium chloride is probably entrapped evapora- 
tives or rising connate brines. To detect possible migrations of these highly 
mineralized waters, a monitoring program was established in Sutter County in 
1953. Earlier records of ground water quality are available from previous 
ground water investigations in this area. 

During 1958, samples were collected from 2? wells in Sutter Covmty. 
Comparison of these samples with those of 1957 reveals slight to moderate 
increases in total dissolved solids in 19 wells. Total dissolved solids in 
the 1958 samples ranged between l59 and 95U ppm in all wells except well 
I2N/2E-II4BI, located near Robbins in the southwestern part of the area, in 
which total dissolved solids were 2,290 ppm. Chloride concentrations in the 
sampled wells varied between 2.ij and l,3hO ppm. The highest chloride concen- 
tration was found in the aforementioned well 12N/2E-1UB1. Chlorides in this 
well have increased fairly steadily during the period 195it to 1958. Five 
wells located in the vicinity of Robbins yielded water with boron in excess 

-h2- 



of 0.5 t)pm, the upper limit recommended for irrigation of boron-sensitive croos. 
Sixteen scattered wells yielded water with total hardness exceeding 200 ppm. 
Gradual increases in chlorides, sodiam, and total dissolved solids were noted 
in several wells in the southeastern part of the area during the five-year 
period, 1953 to 1958. During 1958, gross radioactivity in the wells tested 
ranged from 0.0 to 26.63 MUc/l. 

Yuba County . The portion of Yuba County which is included in the 
monitoring program includes only the valley floor area. It is bounded by 
Sutter County on the west and extends to the foothills of the Sierra Nevada 
on the east. This valley floor portion is approximately 25 miles in maximum 
north-south length, and varies between 8 and 12 miles in east-west width. 

Ground waters in Yuba County are generally of good to excellent 
mineral quality and are usable for all present purposes. However, saline 
water is found in the southern part of the county. The source of these 
saline waters has not, as yet, been determined. 

Although Yuba County was included in the monitoring program as a 
part of the Sutter-Yuba monitoring area prior to 1957, there were few wells 
sampled in this portion of the area and little data were available. During 
1958 the areas were separated and an expansion of the monitoring program in 
Yuba County was initiated. 

Ranges of pertinent constituents in the six wells sampled in Yuba 
Coiinty during 1958 were as follows: total dissolved solids, from 157 to 
308 ppm; chlorides, from 7 to h9 Ppm; and boron concentrations, from 0.00 
to 0.60 ppm, with only one well exceeding 0.26 ppm. Sodium percentages ranged 
from 17 to lal percent of base constituents. One of the monitored wells in 
Yuba County was tested for radioactivity during 1958. The gross radioactivity 
in this well was 2.10 n^c/l. 



-Ii3- 



Yolo County . The area of Yolo County included in the monitoring 
program lies mainly in the eastern portion of the county on the Sacramento 
Valley floor. The Capay Valley portion, however, extends along Cache Creek 
from the Tovm of Capay northwesterly to Rumsey in the western portion of the 
county. The total monitored area includes about 650 square miles. 

The ground waters of Yolo County are predominantly bicarbonate in 
type. The most serious quality problem is the presence, throughout the county, 
of possibly injuriovis concentrations of boron. High concentrations of chloride 
have also been found adjacent to the Sacramento River and in other local areas. 
The ground water is generally very hard. 

A monitoring program was established in Capay Valley in 1953 and 
expanded in 1957 to include the present monitored area described above. 

Analyses of samples collected from 33 wells in 1958 showed class 2 
or 3 irrigation water in 2U of the wells. High boron concentrations were the 
principal cause of degradation in these wells. Comparison of 1958 analyses 
with those of 1957 showed only slight changes in mineral constituents in 
most wells. Boron increased in a few wells; the most notable increase occurred 
in well 11N/2E-22A1, near the Sacramento River, where boron increased fixim 
0.8^ to U.6 ppm. Well 10N/2W-18f1, in the Capay Valley, showed an increase 
in chlorides from 191 ppm in July 1957 to 350 ppm in July 1958. Well 
7N/3E-9J1, located about seven miles southeast of Davis, showed an exception- 
ally large increase in nitrate, from 1.2 to 12U ppm. Such high concentrations 
of nitrates frequently indicate contamination of the ground water from a 
surface source. The ground waters were mostly very hard, with total hardness 
ranging from 68 to 82i; ppm. The highest count of gross radioactivity found 
in the monitored wells was 12.60 ji^c/l. 

Sacramento County . This monitored area comprises most of Sacramento 
County. The only areas not included are a small area in the Sacramento -San 

-hh- 



Joaquin Delta where little ground water is used, and the area along the east- 
ern boundary which is underlain by formations that yield negligible quantities 
of ground water. 

Ground waters in Sacramento County are generally of excellent mineral 
quality, although there are localized areas where water q\iality is a problem. 
The ground waters generally contain less than 350 ppm total dissolved solids 
and less than 0.3 ppm boron. Sodium percentages seldom exceed 50 percent and 
total hardness is generally less than 200 ppm. An industrial waste (from the 
Aerojet-General plant) in the eastern portion of the county contains potassium 
perchlorate (KClOi ) and ammonium perchlorate (NH[^C10^) in solution. The perchlor- 
ates of potassium and ammonium are reported to be toxic to plant life to approx- 
imately the same extent as boron. Accordingly, analyses of samples near this 
waste discharge include tests for these industrial components. 

A monitoring program was established in Sacramento County in 1955 to 
record the present ground water quality and to detect changes due to existing 
sources of degradation. 

During 1958, samples were taken from 28 wells in Sacramento County. 
Total dissolved solids in these samples ranged between llU and U9U ppm. Chloride 
concentrations did not exceed UU ppm, and boron ranged between 0.00 and 0.53 ppm. 
Sodium percentages did not exceed 143 percent and hardness was less than 280 ppm. 
No significant changes in groiind water quality were detected, and no prevailing 
trends were discernible. Perchlorate ion (ClOi ) and ammonium ion (NHj ) concen- 
trations did not exceed 0.5 ppm in any samples analyzed, indicating that these 
constituents were not present in amounts toxic to plant life. Gross radioactivity 
was 10.53 WJc/l or less in the tested wells. 



-U5- 



San Joaquin Valley (5-22) 

The San Joaquin Valley floor comprises about 10,000 square miles of 
irrigable lands and extends from the Tehachapi Mountains northward to the vicin- 
ity of the Cosumnes River. Underlying this valley is the largest ground water 
reseirvoir in the State. The storage capacity of this great reservoir, to a 
depth of 200 feet below land surface, has been estimated at 100,000,000 acre- 
feet. A bed of diatomaceous clay, generally known as the Corcoran clay, con- 
tinuous throughout most of the San Joaquin Valley, separates this reservoir 
into upper and lower ground water zones. This clay bed is about UO to 50 feet 
thick and generally lies between 300 and 350 feet below the land surface. Wells 
in the western portion of the valley draw water principally from the lower zone, 
due mainly to the poor quality of upper zone waters. Wells in the remainder of 
the valley produce good quality waters from both zones. Most of the San Joaquin 
Valley has been included in the monitoring program and is reported hereinafter 
by counties. 

San Joaquin County . The area of San Joaquin County included in the 
monitoring program comprises most of the valley floor portion of the county. 
The area extends from the Sacramento county line on the north to the Stanislaus 
county line on the south, and varies in width from about ih to 30 miles. 

Ground water in San Joaquin County is generally suitable for both dom- 
estic and agricultural uses, although some of the water contains moderately 
high boron concentrations. In the vicinity of the City of Stockton, a threat 
to water quality exists due to saline water bodies which underlie the area and 
extend under most of the delta lands at varying depths in the northwestern part 
of the county. 

A monitoring program was established in the vicinity of Stockton in 
1953, and extended to include most of the county in 1957, to detect degradation 



-16- 



of good quality waters by the migration of poor quality waters which are located 
primarily in the western part of the coxmty. 

Fourteen of the 37 wells sampled in 1958 contained boron concentra- 
tions in excess of 0.5 ppm, the highest being 1.7 ppm in well 2S/5E-23P1, located 
approximately 16 miles southwest of Stockton. In general, the boron concentra- 
tions remained approximately the same as found in previous years, with the higher 
concentrations located primarily in the western portion of the monitored area. 

Total dissolved solids exceeded 700 ppm in 9 of the monitoring wells 
located in the southwestern part of the county, some showing increases over 
concentrations found in previous analyses. Well 2N/6E-29N1, located about 3 
miles northeast of Stockton, showed an increase in total dissolved solids from 
liG8 ppm in July 195U, to 9UU ppm in September 1958. Total dissolved solids 
in wells 23AE-36P1 and 2S/5E-28L1, located near Tracy, increased from 320 to 
8U7 ppm, and from 6l5 to 730 ppm, respectively, between 1957 and 1958. 

Chlorides in a few wells near Stockton were high, but there was no 
indication of increased degradation of surrounding waters. Ground waters through- 
out the monitored area were predominantly very hard, with 20 of the monitored 
wells showing greater than 200 ppm total hardness. Percent sodium was high 
in a few wells, particularly in the vicinity of Stockton. Sulfates exceeded 
250 ppm in 2 adjacent wells located approximately 2ii miles south of Stockton. 
Gross radioactivity in the monitored wells ranged from 0.0 to 21;. 7U fxjic/l during 
1958. 

Stanislaus County . The monitored portion of Stanislaus County covers 
approximately 800 square miles and includes all of the valley floor area in 
the county except an area of about l85 square miles in the north central portion. 

Ground waters in the east side of the monitored area are generally 
bicarbonate in type and of excellent mineral quality. The west side ground 
waters are chiefly a calcium-magnesium bicarbonate type of good to excellent 

-hi- 



qiiality. SodiTun chloride type waters containing high concentrations of total 
dissolved solids have been found in the trough of the valley. Waters moderately 
high in boron and sulfate also occur in the west side of the county. These 
potential sources of ground water degradation in Stanislaus County prompted the 
establishment of an annvial monitoring program in the area in 1957. 

Analyses of sanples collected from Sh wells in Stanislaus County in 
1958 showed, in general, about the same ranges of mineral constituents as those 
samples collected in 1957. Twenty-one wells contained total dissolved solids 
in excess of 700 ppm. Well 3S/13E-32D1, located about six miles southwest of 
La Grange, adjacent to the Tuolumne River, showed an increase in total dissolved 
solids from 2,760 ppm in September 1957 to 3,l6U ppm in July 1958. On the other 
hand, total dissolved solids in well 7S/8E-22K1, located about lU miles west of 
Newman, decreased from I,l80 to 66U ppm during the same period. Chlorides in 
the latter well also decreased significantly, dropping from 602 to 77 ppra. 
Boron, in well 7S/8E-22K1, however, increased from O.lU to 0.6 ppra during this 
ten-month period. Boron concentrations decreased in several other wells, but 
not in sufficient magnitude to indicate a general improvement in the quality of 
ground water s\:5)plies. Waters from 2U of the 5U monitored wells contained boron 
concentrations of 0.5 Ppm or greater. Chlorides ranged from a low of 3 Ppm to 
a high of 1,628 ppm, with Ih wells having more than 175 ppm chloride. Only 2 
wells contained more than 60 percent sodium, the highest being 8U percent in 
well iiS/llE-5Ml, located on the south bank of the Tuolumne River, about 2 miles 
west of Hickman. Hardness ranged from soft to very hard, exceeding 200 ppm in 
31 wells. Sulfate concentrations in excess of 250 ppm were found in h of the 
monitored wells, virtually the same in that respect as shown by the 1957 analyses. 
Gross radioactivity ranged from 0.0 to 52.28 ji^c/l. 



-Ii8- 



Merced Coimty. Two separate areas are included in the monitoring pro- 
gram in Merced Coxinty. One area lies along the west side of the San Joaquin 
River between the Stanislaus and Fresno County lines. This area varies in width 
from 6 to 16 miles, is about 32 miles in length, and includes about 300 square 
miles. It encompasses the land in Merced County served by Central California 
Irrigation District. The second area is located east of the San Joaquin River 
in the central part of the county. It is from 10 to 12 miles in width, about 
IiO miles in length, and incliides an area of about UOO square miles. Merced 
Irrigation District, and a portion of Turlock Irrigation District, are located 
in this second area. A monitoring program was established in Merced County 
during 1957 to maintain surveillance on water quality conditions, and to detect 
possible movement of mineralized water near the trough of the valley. 

Although ground waters west of the San Joaquin River have a high 
chloride content, the predominant anions are sulfate and bicarbonate. Wells 
east of the river, less than 200 feet in depth, yield calcimn bicarbonate water 
of excellent quality. Groimd waters from the deeper wells are of similar anionic 
composition; however, they generally have a much higher sodixan content. 

Wells on the west side of the San Joaquin River yielded waters of 
variable mineral quality in 1958. Total dissolved solids ranged from 391 to 
2,9li6 ppm and percent sodium from 26 to 6h. Waters from h of the 13 monitor- 
ing wells in this area contained total dissolved solids in excess of 1,000 
ppm, with the highest value (2,9h6 ppm) found in well 11S/10E-23K1, located 
in the southwestern portion of the monitored area. Eight wells yielded water 
containing boron concentrations in excess of 0.50 ppm, the highest of which was 
3.0 ppm in well 12S/11E-3C1, located in the extreme southern portion of the 
monitored area. Samples from wells 11S/10E-23K1, located about 7 miles 
south of Los Bancs, and 12S/11E-3C1, located about 6 miles southwest of Dos 
Palos, contained sulfates of 1,0U3 and 528 ppm, respectively. Well 11S/10E-23K1 

-19- 



also contained 73 ppm nitrates. These concentrations exceed the sulfate and 
nitrate limits for drinking water recommended by the State Board of Public 
Health (Appendix C). Total hardness varied from 133 to 1,371 ppm in the west 
side wells. 

Wells sampled on the east side of the San Joaquin River yielded 
waters of good to excellent mineral quality in 1958. Twenty of the 33 monitor- 
ing wells in this area contained total dissolved solids concentrations below 
300 ppm, and 29 wells contained sodium percentage below 50. Maximum values were 
62U ppm total dissolved solids and 68 percent sodium, found in well 6s/10E-28K1, 
located approximately two miles southwest of Irwin. Boron ranged from to l.h 
ppm and total hardness was below 200 ppm in all but two of the east side wells. 

Gross radioactivity in the entire monitored area of Merced County 
ranged from O.kl to 79.31 mm c/l, with the high value found in well 7S/IIE-I4MI, 
located about three miles southwest of Livingston. This value of 79.31 pipic/l 
was the highest value of gross radioactivity found in the Northern California 
portion of the monitoring program. However, it was below the provisional safe 
limit of 100 wc/l. 

Madera County . All of the valley floor land in Madera County is in- 
cluded in the monitoring program. It extends from the foothills on the east 
to the San Joaquin River on the west, and from the Merced courvEy line on the 
north to the Fresno county line on the south r 

Calcium- sod iim bicarbonate type waters of excellent mineral quality 
are found, generally, in wells less than 350 feet deep. Water in the lower 
zones in the western part of the county, effectively confined by the Corcoran 
clay, is predominantly of sodium bicarbonate type, with sodium percentages often 
exceeding limits recommended for irrigation waters. Wells in the western part 
bordering the San Joaquin River yield waters high in chlorides. 



.50- 



The existence of high chloride concentrations in portions of the 
aquifers and high percentage sodium in the lower water-bearing zones, prompted 
the incliision of Madera County in the monitoring program in 1957. 

Comparison of the analyses of sampled collected from 27 wells in 1958 
with those collected iri 1957 showed no significant changes in water quality in 
Madera County. Water in 2i| of the 27 wells sampled was of excellent mineral 
quality. Three wells, however, remained excessively high in percent sodium, 
ranging from 83 to 98 percent. These three wells were all adjacent to the San 
Joaquin River in the southwest part of Madera County. Sodium ranged from 27 
to 98 percent of base constituents. The highest count of gross radioactivity 
found in waters sampled in Madera County in 1958 was 15.9U WJc/l. 

Fresno County. The monitored area in Fresno County includes that 
portion of the valley floor area which extends from the Sierra Nevada foothills 
on the east to the base of the Diablo Range on the west, and from the Merced 
CDiinty line on the north to the Kings County line on the south. The total area 
is approximately 2,500 square miles. 

There are two major water-bearing zones in the west side area, each 
of which contain water of variable quality. The upper zone extends to a depth 
of 200 to 300 feet below the surface and yields a calcium-magnesium sulfate type 
water with total dissolved solids as high as 3,000 ppm and sodium percentage of 
about 35. The lower zone yields a sodium sulfate water with a total dissolved 
solids concentration of about 800 ppm and sodiimi from 70 to 90 percent. This 
lower zone furnishes about 80 percent of the ground water supply in the area. 

A serious water quality problem exists in the west side area of Fresno 
County. Highly mineralized waters occur in both the upper and lower ground 
water zones. High boron concentrations are found in ground waters in local 
areas and, in addition, there is evidence of ground water degradation by oil 



-51- 



1 



field wastes. For example, wastes from Raisin City Oil Field operations were, 
for many years, discharged into unlined sumps with final disposal being achieved 
by evaporation and percolation. As a result, wells adjacent to these sumps 
have contained waters with chloride concentrations and sodium percentages in 
excess of the general level of ground waters in the area. These wastes are 
presently being disposed of by injection into the iinderlying saline water body 
through deep wells. 

These existing and potential problems prompted the inclusion of Fresno 
Coiinty in the monitoring program in 19$3. During 1958, samples were collected 
from 63 wells in the county; [i9 wells were in the west side area, 8 wells in the 
vicinity of the Raisin City Oil Field, and 6 wells in the area served by the 
Fresno Irrigation District. 

Comparison of 1958 analyses with those of 1957 or earlier showed no 
significant changes in concentrations of mineral constituents. Thirty of the 
63 monitored wells contained class 3 irrigation waters, due primarily to exces- 
sive boron or high percent sodium. Twenty-three were class 2. Only those wells 
in the eastern portion of the monitored area near Fresno were predominantly of 
excellent mineral quality. The greatest increase in boron, from 0.6 ppm in 195? 
to 2.1 ppm in 1958, occurred in well 20S/15E-25D2, located in the southern portion 
of the west side area. Well 12S/13E-9C1, located in the northern portion of the 
area, showed a decrease in boron from 6.8 to 3.8 ppm between 1957 and 1958. 
Seventeen wells contained chloride concentrations greater than 200 ppm, the high- 
est being l,OijO ppm in well l[iS/l5E-31Nl, located approximately 6 miles south 
of Mendota. These concentrations remained virtually unchanged from those shown 
in 1957. Twenty-one wells produced waters with percent sodium of 70 or greater. 
Wells 20S/15E-26M1, located about 2 miles northeast of Coalinga, and 20S/17E-9R1, 
located about 1 mile west of Huron, contained nitrate concentrations of 65 and 
53 ppm, respectively. Forty-one wells contained sulfate concentrations in excess 

-52- 



of 250 ppm, the limiting sulfate concentration recommended for drinking water. 
Gross radioactivity ranged from 0.0 to 29.12 Wic/l. 

Tulare County . The portion of Tulare Covinty included in the ground 
water quality monitoring program comprises the valley floor area between the 
western Sierra Nevada foothills and the Kings county line. This area occupies 
approximately the western one- third of the county. Its maximum dimensions are 
about 58 miles north to south and 37 miles east to west. 

Ground waters in the eastern half of the monitored area, along the 
Sierra foothills, are of calcium bicarbonate type with total dissolved solids 
averaging approximately 250 ppm. This water is typical of the shallow-to- 
moderate-depth ground water zones deriving recharge from the Sierra streams. 
Sodivnn bicarbonate type water occurs at greater depths and to the west of those 
areas containing calcium bicarbonate type water. Percent sodium in this water 
frequently exceeds 75 percent. 

The ground water qixality monitoring program in Tulare County was 
begun in 1957. In 1958 samples were collected from 11 monitoring wells. There 
are, in addition, considerable data on water quality in Tulare County made 
available thro\igh the cooperation of the United States Geological Survey, which 
has recently conducted special water quality investigations in much of the south- 
em portion of the monitored area. 

Ground water of excellent quality was found in wells in the north- 
western portion of the monitoring area during 1958. Wells in the southern portion, 
however, produced waters with high percent sodium, reaching 95 in well 2US/27E-32P1, 
located about 12 miles southeast of Earlimart. This well was also moderately 
high in boron, increasing from O.UO to 0.93 ppm boron during the period from 
June 1957 to August 1958. Analyses showed high chlorides and high total dissolved 
solids in wells immediately south of the Tule River near the Kings County line. 



-53- 



Well 22S/23E-6A1, for instance, contained 657 ppm chlorides, and well 22S/23E-7A2 
contained 1,8144 ppm total dissolved solids, the highest values found in 1958. 
Boron ranged from 0.00 to 0.93 Ppm in the sampled wells. The highest count of 
gross radioactivity was 22.0 jjipc/l. 

Kern County . The monitoring program in Kern County enconqjasses that 
area extending from the northern boundary of Kern County south to Wheeler Ridge, 
and from the Tehachapi Mountains on the east to the Coast Range on the west. 
The area is approximately 60 miles in length and averages 35 miles in width. 

Ground waters in Kern County vary considerably in mineral character- 
istics. High concentrations of boron and other minerals occur throughout large 
portions of the monitored area, particularly in the south and west. The dis- 
charge of oil field waste waters is a potential source of pollution to local 
water supplies, since its disposal is often accomplished through the use of per- 
colation basins. Ground water in the vicinity of Devils Den Oil Field area con- 
tains mineral concentrations in excess of those recommended for domestic use 
and for irrigation of most crops. Because of the possibility of ground water 
quality impairment by disposal of oil field wastes, the Central Valley Regional 
Water Pollution Control Board has adopted requirements for the disposal of wastes 
from most of the oil fields in Kern County. The resultant improvement in waste 
disposal practices has considerably lessened the threat to groxind water qviality. 

A monitoring program was begun in the Devils Den and Edison Oil Field 
areas in 1953 to maintain a check on effects of waste water disposal. The re- 
mainder of the monitoring area was added in 195?. 

Analyses of samples collected from Ul monitoring wells in 1958 showed 
no significant changes in mineral quality as compared to previous years. Six- 
teen wells contained total dissolved solids in excess of 700 ppm, the ipper 
limit for class 1 irrigation waters, the highest being U,6lO ppm in well 



-5U- 



i 



31S/2UE-28B1, located about 3 miles northeast of Ford City. Chlorides exceeded 
175 ppm in 11 wells, located primarily in the southern and western portions of 
the monitored area. High concentrations of boron were found in wells scattered 
throughout the southern half of the monitored area. Twenty wells contained boron 
concentrations greater than 0.5 ppm, the highest being 7.7 ppm in well 27S/20E-3UG1, 
southwest of Lost Hills. Thirteen of the 1^1 monitored wells contained greater 
than 60 percent sodium. Ground waters in the area south of Bakersfield showed 
relatively low sodium percentages. The water here, however, was extremely hard, 
reaching a high of 1,8U0 ppm total hardness. Sulfates exceeded the recommended 
limit for drinking water, of 250 ppm, in 12 of the sampled wells, the highest 
concentrations occurring in the Devils Den Oil Field area. Well 25S/19E-7P1, 
for instance, showed 2,230 ppan sulfates. Gross radioactivity in the tested 
wells ranged from 0.0 to 39.33 ^l^c/l. 



-55- 



LAHONTAN REGION (No. 6) 

The Lahontan Region consists of that area in California generally- 
east of the drainage divide of the Sierra Nevada, and the Tehachapi, San Gabriel, 
and San Bernardino Mountains (Plate 1). This region includes an area of approx- 
imately 33,000 square miles extending over 600 miles along the eastern boundary 
of California. 

The water supply for the southern portion of this region consists 
mainly of pumped ground waters and, to a minor extent, diverted surface waters. 
The growth of some areas in the southern portion of the region has been affected 
by the limited water supply. Precipitation is sporadic and generally less than 
five inches per year in the Antelope Valley-Mo j ave River area. 

Fifty-eight ground water basins have been identified in this region. 
However, only that portion of Lower Mo j ave River Valley between Barstow and 
Yermo has been included in the monitoring program. 

Lower Mo j ave River Valley, Barstow to Yermo (6-i;0) 

The portion of lower Mojave River \falley ground water basin included 
in the monitoring program extends from the City of Barstow about 25 miles east- 
ward to the City of Yermo. It varies in width from two to seven miles and com- 
prises about 160 square miles. 

The character of ground waters in this area ranges from sodium-calcitmi 
bicarbonate to sodium-calcium bicarbonate-sulfate. The waters are moderately 
hard to very hard, but are generally suitable for present beneficial uses. 
Discharges of sewage effluents and indiistrial wastes to the dry river bed at 
Barstow and Nebo, create a threat to ground water quality. Taste and odor 
problems have caused abandonment of some wells east of the City of Barstow. 
Ground waters in this vicinity contain boron in excess of limits recommended 
for irrigation, and fluoride and sulfate concentrations in excess of limits 

-56- 



specified in drinking water criteria. 

The monitoring program in Lower Mojave River Valley was established 
in 1953 to observe the trends of ground water qixality. Twenty-eight samples 
were taken from iLi monitoring wells in this area in 1958. 

Comparison of analyses of well waters obtained in 1958 with those of 
the seven preceding years indicates that minor variations in mineral quality 
have occurred in this period. Although slight increases or fluctuations were 
noted in mineral concentrations in some wells, no significant trends were noted. 
Total radioactivity in samples from 7 of the II4 wells sampled in 1958 ranged 
from 2.2 to 31.9 MJc/l. The 31.9 ^iMc/l level was found in a sample from well 
9N/1W-10G1, located near the river about two miles east of Barstow, and is the 
highest count found in ground water within the Lahontan Region as well as the 
Southern California District in 1958. However, the radioactivity level in this 
well is much below the maximum permissible concentration for drinking water. 
As the area of higher radioactivity has not been defined, it is planned to expand 
the radiological monitoring program in the vicinity of this well. 



-57- 



COLORADO RIVER BASIN REGION (No. 7) 

The Colorado River Basin Region is bovinded on the north by the southern 
boundary of the Mojave River watershed, on the south by the California-Mexico 
boundary, and on the west by the San Bernardino Mountains and the San Jacinto 
and Peninsular Ranges. The Colorado River and the Nevada state line bound the 
area on the east (Plate 1). This region comprises all basins draining into the 
Colorado River and Salton Sea. The region has an average width of more than 125 
miles, averages about 150 miles in length, and includes an area of approximately 
20,000 sqtiare miles. 

Forty-six ground water basins have been identified in this region, 
one of which has been included in the monitoring program. 

Coachella Valley (7-21) 

Coachella Valley includes an area of about 690 square miles lying along 
the Whitewater River in Riverside Coxinty. It is approximately 65 miles long, 
trends generally in a southeasterly-northwesterly direction, and ranges in width 
from about 3 miles at the northwestern end to 20 miles at the southeastern end. 

The mineral character of ground waters in this area is quite variable. 
Calcium is usually the predominant cation in the northwestern portion of the 
basin near the areas of replenishment from the Whitewater River system, while 
sodium is the predominant cation in the southeastern portion of the basin. 
Bicarbonates are generally the predominant anions j however, sulfates are becom- 
ing more prominent in several wells in the northern portion of the area. 

A shallow perched-water zone which contains an accimulation of rain 
water, waste water, and irrigation return water, having a high mineral content, 
exists in Coachella Valley. There is a possibility that degraded waters of 
the shallow zone can move through abandoned or improperly constructed wells or 
through interconnected aquifers into the deeper zone. 

-58- 



I 



The monitoring pixsgram in the Coachella Valley ground water basin was 
initiated in 1953 to detect any pollution or degradation through interconnected 
ground water zones, and to show any qtiality changes produced by imported water. 
In general, the area included in this monitoring program is the same area that 
uses Colorado River water to supply most of its water requirements. During 1958, 
2U samples were taken from 12 monitoring wells in Coachella Valley. 

Comparison of 1958 analyses with those of previous years shows wide 
variations in mineral concentrations in three wells. Total dissolved solids 
in well 6S/7E-25E1, located about four miles southwest of the City of Coachella, 
increased from 1,521 ppm in July 195h, to 2,3iiO ppn in September 1955, decreased 
to 263 ppm in April 1956, and has been in the range of 260 to U61i ppm since that 
time. Well 7S/8E-22M1, located about three miles southwest of the Whitewater 
River, has shown a trend of increasing chloride concentrations, rising from 85 
ppm in July 19Sh, to 350 ppn in October 1958. Nitrates in well 5S/7E-33C1, 
located about two miles southwest of Indio, increased from ijl ppm in March 1957, 
to Ihl ppm in October 1958. The reasons for these increases are not known. 
Most of above noted significant water quality changes appear to be localized. 

In 1958, waters from four of the monitoring wells, located in the 
southern part of the valley, contained concentrations of fluoride exceeding 1.5 
ppm, the recommended limit for drinking water. Three of these wells produced 
waters containing sodium in excess of 75 percent of base constituents. Total 
radioactivity in the 12 monitoring wells sampled in 1958 ranged from 0.2 to 
7.6 HMc/1. 



-59- 



SANTA ANA REGIOM (No. 8) 

Santa Ana Region comprises the entire drainage area of the Santa Ana 
River, as well as all coastal basins draining into the Pacific Ocean between 
the Los Angeles-Orange county line on the north and west, and the drainage divide 
between Muddy and Moro Canyons on the south (Plate 1). This region extends about 
25 miles along the coast and includes an area of approximately 2,850 square miles. 

Nine ground water basins and 27 sub-basins have been identified in 
this region. Three of these basins have conditions warranting their inclusion 
in the monitoring program. These basins are East Coastal Plain Pressure Area 
(coastal portion), Chino, and Bunker Hill Basins. 

Production of groiind water in a number of basins in this region has 
exceeded the safe yield for several years, resulting in lowered ground water 
levels and increased pumping costs. The use of supplemental Colorado River 
water, by both direct delivery and through spreading operations, is becoming 
more prevalent. 

East Coastal Plain Pressure Area (8-1.01) 

East Coastal Plain Pressure Area occupies a ten-mile wide portion of 
the coastal plain in Orange County. The area fronts on the ocean a distance of 
about 15 miles between the Los Angeles-Orange County line and Newport Beach and 
comprises approximately I80 square miles. A major ground water quality problem 
exists in this area, caused by sea-water intrusion and the disposal of oil well 
brines. Gro\uid waters in East Coastal Plain Pressure Area not affected by salt- 
water intrusion are suitable for present beneficial uses. The better quality 
waters are generally sodium or calciimi bicarbonate in character, while the ground 
water intruded by salt water shifts to a calcium or sodium chloride type. The 
ground waters are moderately hard in character. 



-60- 



Salt-water intrusion of the aqiiifers in this area may originate as 
sea water, oil well brines discharged to land surface, or migration of connate 
waters. Due to the similar characteristics of these degrading waters it is 
difficvilt to identify the source. While sea water is believed to have intruded 
the aquifers located southwest of the Newport- Inglewood fault zone (Plate 7), 
there is no evidence of movement of sea water northward through the faulted 
zone, except in the Santa Ana gap area. 

The monitoring program in East Coastal Plain Pressure Area was estab- 
lished in 1953 to detect impairment to ground water quality caused by disposal 
of oil well brines and by sea-water intrusion. During 1958, 5$ samples were 
taken from 28 monitoring wells. 

In the area affected by intrusion of salt water, the total dissolved 
solids and chlorides have increased rapidly. As an example, well 6s/lOW-6L2, 
located in the Santa Ana gap, has experienced a progressive increase in chlorides 
from 21 ppm in September 19$3 to 2,638 ppm in September 1958. The continued 
landward advance of sea water in the Santa Ana gap is illustrated by the 500 ppm 
isochlor shown on Plate 7, which has advanced as much as one-half mile along 
the flanks of the gap since 1957. Total dissolved solids in the sampled wells 
ranged from 20U to 8,010 ppm, chlorides ranged from 11 to 3,558 ppm, and hard- 
ness from 102 to 3,896 ppm. The maximum count of total radioactivity in sam- 
ples taken from 13 monitoring wells in 1958 was 5-0 »i)ic/l. 

Chino Basin (8-2.01) 

Chino Basin occupies a valley area northwest of the Santa Ana River, 
and extends over portions of Los Angeles, San Bernardino and Riverside Counties. 
The basin is about 20 miles in length, averages 12 miles in width, and comprises 
about 237 square miles. The monitored area comprises the southern portion of 
the basin. 



-61- 



Ground waters in Chino Basin are predominantly calciian bicarbonate in 
character, and are moderately hard to very hard. The waters are otherwise of 
good quality and suitable for domestic and irrigation uses. 

A number of industrial establishments in the San Bernardino County 
portion of Chino Basin discharge wastes to land. Monitoring of the area was 
begun in 19$3 to detect the effects on ground water quality of local disposal 
of domestic and industrial wastes to land, and of importation of Colorado River 
water. Most of the monitoring wells are situated below the critical waste dis- 
charges. The greatest concentration of wells is south of the Ontario International 
Airport near the aircraft maintenance and overhauling facilities. Twelve samples 
were taken from eight monitoring wells in Chino Basin in 1958. 

Comparison of 1958 analyses with those of the five preceding years 
shows a few significant changes in water quality. Well 2S/7W-27A1, located about 
O.U mile east of Cucamonga Creek, shows a decrease in total dissolved solids 
from 715 ppm in 195ii to 500 ppm in 1958. Nitrates increased from 35 ppm in 
June 1957, to U6 ppm in December 1958. In general, wells showing high nitrates 
are located near Cucamonga Creek, downstream from the Ontario- Upland sewage dis- 
posal plant. Total radioactivity of samples obtained from eight wells in Chino 
Basin during 1958 ranged from 0.5 to 5.2 \nic/l. 

Bunker Hill Basin (8-2.06) 

Bunker Hill Basin is located in the Upper Santa Ana Valley in San 
Bernardino County. The valley abuts against the high, rain-catching San Bernardino 
Mountains for a distance of 20 miles. Bunker Hill Basin is approximately eight 
miles in width and encompasses about 92 square miles in the eastern portion of 
this plain. 

Ground waters in Bunker Hill Basin are predominantly calcium bicar- 
bonate in character. They range from slightly hard to very hard but they are 



-62- 



1 



otherwise of good qiiality. 

Local disposal of domestic and industrial wastes to land constitutes 
a potential source of ground water quality impairment in this area. A monitor- 
ing program was initiated in 1953 to detect quality changes which might result 
from percolation of these wastes to ground water. Originally, monitoring wells 
were selected near the site of the waste disposal sumps of the Culligan Zeolite 
Company north of the City of San Bernardino. Since then, additional wells have 
been selected for sampling along the reach of the Santa Ana River below Redlands 
sewage treatment plant and Norton Air Force Base. Twenty-four samples were ob- 
tained from nine monitoring wells in Bunker Hill Basin during 1958. 

Comparison of analyses for 1958 with those of the five preceding years 
indicates some fluctuations in mineral concentration without evidence of any 
definite trend except as nftted in the following discussion. Well 1N/UW-29E3, 
located near sumps of the Cvilligan Zeolite Congsany formerly used for disposal 
of wastes containing sulfuric acid, shows significant increases in both calcium 
and sulfate ion concentrations, and in total dissolved solids as illustrated in 
the following tab\d.ation: 





Calcium 


Sill fate 


Total Dissolved Solids 


Date Sampled 


ppm 


ppm 
3U 


ppm 


12-15-5U 


66 


280 


9-20-55 


77 


60 


290 


9-13-56 


86 


82 


138 


9-25-57 


107 


ia2 


U75 


3-13-58 


113 


158 


5U1 


5-15-58 


112 


17U 


5lU 


9-23-58 


108 


m6 


U80 



A similar trend was noted in water from well 1N/UW-29F1, located in the same 

-63- 



area. No significant changes were noted in sodium or chloride concentrations in 
these two wells. Well IS/3W-8MI, located below the City of Redlands sewage 
treatment plant, shows a continuous increase in total dissolved solids from I78 
ppm in August 1955 to 350 ppm in May 1958. 

Total radioactivity in samples taken from seven wells in 1958 ranged 
from 1.7 to IJ4.9 n\ic/l. The ground water samples collected in 1958, which 
equalled or exceeded 10 upc/l radioactivity, were taken from wells lS/IiW-13F2, 
1SAW-13F3, and 1SAW-13G1, with 10.0, II1.9, and lU.7 wx;/l, respectively. 
These wells are located southwest of the Norton Air Force Base main sewage 
plant. The plant effluent is conveyed by an open ditch, which passes near these 
wells, to the Santa Ana River. No definite conclusions can be drawn from the 
data presently available. 



-61^- 



SAN DIEGO REGION (No. 9) 

The San Diego Region comprises all basins draining into the Pacific 
Ocean from the drainage divide between Muddy and Moro Canyons in Orange County 
on the north, to the California-Mexico boundary on the south. The region aver- 
ages hS miles in width and occupies an area of approximately 3,830 square miles 
(Plate 1). 

Fifty-four ground water basins have been identified in this region. 
Of these, the following areas have been included in the monitoring program; 
San Luis Rey Valley, Mission Basin; El Cajon Valley; and the portion of Tia 
Juana Valley located within the United States. 

San Luis Rey Valley, Mission Basin (9-7.01) 

San Luis Rey Valley is a long, narrow river valley in northern San 
Diego County, extending approximately 30 miles inland from the Pacific Ocean. 
The area monitored is the lower portion of the valley, now called Mission Basin, 
a hydrologic division of San Luis Rey Valley, extending inland to Bonsall 
Narrows about 8 miles from the ocean. The monitored area comprises about 6 
square miles. The principal pumping zone consists of about 100 feet of xm~ 
confined permeable sands and gravel occurring beneath a section of fine sand, 
silt or clay. 

The character and mineral quality of ground water in this area is 
extremely variable. The waters are generally very hard and are of poor mineral 
quality, but are extensively used for donestic and agricultural purposes. De- 
terioration of ground water quality in wells near the coast has been evident 
for many years. This deterioration is attributed to an adverse salt balance, 
inflow of water of inferior quality from adjacent older sediments, and sea- 
water intrusion. Under present and expected future conditions of development, 
continued in^airment may render more and more of the ground water unsuitable 

-65- 



for domestic use and irrigation. 

A groxind water monitoring program was begtm in 1953 to observe the 
effects on water quality of sea-water intrusion, inflow from older sediments, 
and an adverse salt balance. 

Twenty- two samples were taken from 13 monitoring wells in 1958. The 
wells are divided into two groups for the discussion of water quality. One 
group is in the area influenced by sea-water intrusion and the other group is 
in the inland area affected hy other quality problems. 

In the sea-water intrusion area, 13 samples were collected from 7 
wells. Analyses of these samples show that total dissolved solids ranged from 
910 to 20,000 ppm, chlorides from 170 to 8,550 ppm, sulfates from 135 to l,lii2 
ppm, and boron from 1.65 to 2.5 ppm. Water from well 11S/5W-23E1, located 0.7 
mile from the ocean, contained 20,000 ppm total dissolved solids, the highest 
concentration found in this area. This is believed to be due to the intrusion 
of sea water. 

In the inland area, nine samples were taken from six monitoring wells. 
Analyses of these samples show the following ranges: total dissolved solids 
from ii60 to 1,918 ppm, and chlorides from 99 to 677 ppm. Wells in this area 
located near the river produced ground water of good quality. Poorer quality 
water was found in wells near the foothills. The chloride concentration in 
well llS/i|W-5Kl, located in the valley near the river, was 99 ppm in March 
1958, while well 11S/UW-8J1, located near the foothills, showed a chloride 
content of 636 ppm in the same month. 

Comparison of analyses for the period 1953 to 1958 shows that the 
mineral concentrations in ground waters have increased, and that the chloride 
content has increased substantially. The most notable chloride increase occurred 
in well 11S/5W-23E1, located in San Luis Rey River channel 250 feet north of 
the mouth of Lawrence Canyon in which chlorides increased from 3,600 to 8,5i|0 ppm 

-66- 



between October 19^3 and October 19^8. The highest count of total radioactivity 
of samples taken from eight monitoring wells in 1958 was 8.6 jifc/l. 

El Cajon Valley (9-16) 

El Cajon Valley is a small inland valley in the southwestern portion 
of San Diego County. It is approximately 5 miles wide, h miles long, and com- 
prises an area of about 22 square miles. The valley is tributary to the mid- 
dle portion of the San Diego River. It is surrounded by low hills except for 
a small opening into the San Diego River Valley. 

Ground waters of El Cajon Valley are predominantly sodium chloride in 
character. The waters are moderately hard to very hard, and are high in total 
dissolved solids, chlorides, and nitrates. This water is considered to be gen- 
erally of inferior quality for domestic use. The area was included in the mon- 
itoring program in 1953 to detect changes in quality due to use and reuse of 
water and changes resulting from the importation of Colorado River water. Nine- 
teen samples were collected from 10 monitoring wells in El Cajon Valley during 
1958. 

Analyses indicate that a gradual increase in mineral concentration has 
occurred in El Cajon Valley diiring the period 1953 to 1958. However, it is diffi- 
cult to detennine the significance of quality changes because of large fluctua- 
tions in mineral concentrations. Of special note is well l6S/lW-3C2, located 
near the City of El Cajon, in which the mineral quality has fluctuated widely 
in the last three years. Total dissolved solids in this well increased from 
1,130 ppm in April 1956, to 2,292 ppm in July 1957, and then decreased to 1,021 
ppm in November 1958. The chlorides and nitrates varied in a similar manner in 
waters from this well. Total dissolved solids in the monitored wells ranged 
from 789 to 2,289 ppm, chlorides ranged from 197 to 782 ppm, and nitrates ranged 
from to 160 ppm. Total hardness varied from 167 to 868 ppm in the monitored 



-67- 



wells during 19^8. Total radioactivity in 9 samples collected during 1958 did 
not exceed $.9 jx^c/l. 

Tia Juana Valley Basin (9-19) 

Tia Juana Valley Basin, the most southerly ground water basin in the 
San Diego Region, is situated approximately l5 miles south of the City of San 
Diego. The ground water basin extends along the Tia Juana River into Mexico. 
The monitored area is the portion of the valley l3ring along the lower reach of 
the river from the United States-Mexico boundary to the ocean. This area is 
about 5 miles in length, averages 1.5 miles in width and includes an area of 
apparoximately 7 square miles. 

Ground waters in Tia Juana Valley Basin are sodixan chloride in charac- 
ter. They are of poor mineral quality, but are being used for domestic and agri- 
cultural purposes. The poor quality of this ground water is probably due to 
adverse salt balance, reuse of water, sea-water intrusion, or a combination of 
these conditions. 

During the period since 19U7, quality degradation has been noted in 
waters from several wells in the coastal area. The coastal portion of this 
basin was included in the monitoring program in 1953 "to determine the extent 
and rate of ground water deterioration. Samples were obtained from 13 monitor- 
ing wells in 1958. 

A continued increase in aiineral concentration is evident in U 
observation wells which are situated across the lower end of the Tia Jviana 
Valley Basin between 0.? mile and 1.5 miles from the ocean. Chlorides in well 
19S/2W-5C6, located about 1 mile inland from the ocean, increased from 6U9 to 
5,l50 ppa between August 1953 and Jvme 1958. This change ia attributed to the 
movement of salt water in the producing aquifer. 

Some wells located inland from the present observation wells and south 



-68- 



of the Tia Juana River have recently been removed frcwi vise due to degraded 
water quality. These wells include fonner monitoring well 19S/2W-5G1, located 
about 1.3 miles inland from the ocean, in which chlorides increased from 836 
ppm in August 1953, to 1,886 ppm in July 1957. Though the source of this de- 
gradation is not positively identified, it is believed that intruding salt 
water may be affecting the quality in this area. 

Mineral content in wells located farther inland has increased pro- 
gressively during the period of record. This increase is probably due to an 
adverse salt balance, migration of connate waters fraa older sediments which 
border the valley, or both. Chlorides in well 19S/2W-2E1, located nearly h 
miles inland from the ocean, increased from 638 ppm in 1953, to 871 ppm in 1958. 
Total dissolved solids in these inland wells ranged frcm 1,U50 to 10,6iiO ppm; 
chlorides from UI6 to 5,l50 ppmj and sulfates from 30 to 500 ppm. Total hard- 
ness ranged from 73 to 3,069 ppm in these wells. Nine samples taken frc» mon- 
itoring wells in Tia Juana Valley Basin in 1958 were tested for total radioactivity. 
The maximum coxint found was 11.2 [i\jc/l. 



-69- 



PLATE I 




3-4 Salinas^n^' 



3-12 Santa /^" 
3-13 Cuyom*//*^ 

LOSI 



4-4.01 Oxni 

4-11.02 Wes 
Ai 
T<| 

Ai 

4-11.03 & 
4-11.04 Cent 

4-13.01 Main 



m 



STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

QUALITY OF GROUND WATERS IN CALIFORNIA 

MONITORED AREAS 
1958 

SC4I.E OF MILES 
10 10 ?0 50 10 50 

I I I I 



INDEX TO MONITORED AREAS 



NORTH COASTAL REGION 


{NO. Ij 


CENTRAL VALLEY REGION (NO. 5) 


1.1 Smifh River Plain 




5-6 Redding Bosin 


1-3 BuHe Volley 




5-13 Upper Loke Volley 


1-4 Shnito Volley 




5-15 Kelseyville Volley 


t-5 ScoH River Volley 




5-21 Socromenio Volley 


1-8 Mod River Volley 




Tehama County 


1-9 EurekoPIoin 




Glenn County 


1-10 Eel River Valley 




BuHe County 


1-15 Ukiob Volley 




Coluso County 


1-16 Sanel Volley 




Sutter County 


M7 Alexondef Valley 




Yubo County 
Yolo County 


MS Sonto Roso Volley 




Socfomenlo County 


SAN FRANCISCO BAY REGION (NO 2) 


5-22 Son Joaquin Volley 


2-5 Cloyton Volley 




Son Jooquin County 


2-6 Ygnacio Volley 




Stonisloui County 


2-9 Soma Claro Valley 




Merced County 


Eojt Boy Area 




Madera County 


South Boy Areo 




Fresno County 


3-10 Livermore Valley 




Tulare County 
Kern County 


CENTRAL COASTAL REGION 


fNO. 3) 




3-2 Pajoro Volley 




LAHONTAN REGION (NO. 6) 


3-4 Solinoi Volley 




6-40 Lower Mojove River Valley. Borstow to Yermc 


3-7 Cormel Volley 






3-12 Soota Mono River Volley 




COLORADO RIVER BASIN REGION (NO, 7) 


3-13 Ciryomo Valley 




7-21 Coochello Volley 


LOS ANGELES REGION (NO. 4) 


SANTA ANA REGION (NO. 8) 


4-4 01 O.nord Ploir. Boi.r. 




8-1 .01 Eoil Coastal Ploin Preuure Areo 


4-11.02 West Coosi Bosin 




6-2.01 ChinoBosin 


Areo of Seo-W/oter Inlrosi 


n 


8-2.06 Bunker Hill Boiin 


Torrance Areo 






Atheni Area 






41 1 03 & 

4-11.04 Centrol Cooitol Ploin Preisu 




SAN DIEGO REGION (NO. 9) 


e Areo and Los 


9-7.01 Son Lull Rey Volley, Mission Bosin 


Angeles Foieboy Areo 




9-16 El Cojon Volley 


4-13 01 Moin Son Gabriel Bonn 




9-19 Tio Juana Valley Bosin 




-- / 






DEPARTMENT OF WATER RESOURCES 
QUALITY OF GROUND WATERS IN CftLIFOHNIO 

MONITORED AREAS 
1958 




OEPfiRTMENT OF WATER RESOURCES I95t 







LINE OF 100 PttfiTS PER MILLION CHlOBiDE 
COMCENTRATION iN GROUND WATERS 

1958 -— ^-^ 
1957 - — -^ 
1951 ••••..- 



STATE OF CALIFORNIA 

DEPARTMENT OF WATER RESOURCES 

DIVISION OF RESOURCES PLANNING 

QUALITY OF GROUND WATERS IN CALIFORNIA 

STATUS OF SEA^TER INTRUSION 
PAJARO VALLEY 



SCftLE OF FEET 

4000 



DEPARTMENT OF WATER RESOUflCES ItM 




DEPaRTMENT OF WATeR RESOURCES 1958 




STATUS OF SEA-WATER INTRUSION 
OXNARD PLAIN PRESSURE AREA 



DEPARTMENT OF waTER RESOURCES !»»■ 




QUALITY OF GROUND WATERS IN CALIFORNIA 

STATUS OF SEA^TER INTRUSION 
WEST COAST BASIN 



OEPfiRTMENT OF WATER RESOURCES ItBI 




DEPARTMENT OF WATER RESOUfiCM 



APPENDH A 
MONITORING AREA INFORMATION 



Page 



Number of Monitoring Wells and 

Sampling Times, 1958 A-1 

General Information on Monitored Areas A-3 



NUMBER OF MONITORING '^LLS AND SAMPLING TIMES 

1958 



Monitored Area 

NORTH COASTAL REGION (No. 1) 
Smith River Plain (l-l) 
Butte Valley (1-3) 
Shasta Valley (l-U) 
Scott River Valley (1-5) 
Mad River Valley (1-8) 
Eureka Plain (1-9) 
Eel River Valley (l-lO) 
Ukiah Valley (1-15) 
Sanel Valley (l-l6) 
Alexander Valley (l-l?) 
Santa Rosa Valley (l-l8) 

SAN FRANCISCO BAY REGION (No. 2) 
Clayton Valley (2-5) 
Ygnacio Valley (2-6) 
Santa Clara Valley (2-9) 

East Bay Area 

South Bay Area 
Livermore Valley (2-10) 

CENTRAL COASTAL REGION (No, 3) 
Pajaro Valley (3-2) 
Salinas Valley (3-U) 
Carmel Valley (3-7) 
Santa Maria River Valley (3-12) 
Cvyama Valley (3-13) 

LOS ANGELES REGION (No. h) 

0:cnard Plain Basin (U-U.Ol) 
West Coast Basin (I4-II.O2) 

Area of Sea-Water Intrusion 

Torrance Area 

Athens Area 
Central Coastal Plain Pressure Area 

and Los Angeles Forebay Area 

(ii-11.03 and h-ll.OU) 
Main San Gabriel Basin (U-13.01) 

CENTPJVL VALLEY REGION (No. 5) 
Redding Basin (5-6) 
Upper Lake Valley (5-13) 
Kelseyville Valley (5-l5) 
Sacramento Valley (5-21) 

Tehama Coianty 

Glenn County 

Butte County 



No. of 

Times Period During 

No. of Sampled, Which Samples 

Wells 1958 Were Collected 



17 


1 


June to October 


11 


1 


July and August 


8 


1 


July 


h 


1 


July 


10 


1 


August and September 


2 


1 


September 


12 


1 


September 


12 


1 


July to September 


5 


1 


July to September 


8 


1 


July 


21 


1 


July- 


9 


1 


August 


8 


1 


Augiist 


23 


1 


January to December 


10 


1 


October 


31 


2 


May and October 


31 


1 


July and Augxast 


55 


1 


June and July 


7 


1 


August 


20 


1 


November 


lU 


1 


May to December 



19 

8 
8 
6 



5 
10 



27 

13 

9 

2U 
22 
23 



2 
2 
2 



2 
2 



1 

1 
1 

1 
1 
1 



April and October 

March and October 
March and October 
March and October 



June and December 
June and December 



August to October 
July 
July- 
July and August 
July 
May to October 



A-1 



NUMBER OF MONITORING WELLS AND SAMPLING TIMES 

1958 
(Continued) 



No. of 

Times Period During 
No. of Sampled, Which Samples 



Monitored Area 


(Continued) 


Wells 


1958 


Were Collected 


CENTRAL VALLEY REGION (No. 5) 








Sacramento County (5-21) 


(Continued) 








Colusa County 




27 


1 


July 


Sutter County 




27 


1 


June to October 


Yuba County 




6 


1 


June to September 


Yolo County 




33 


1 


July 


Sacramento County 




28 


1 


July- 


San Joaquin Valley (5-22) 










San Joaquin County 




37 


1 


June to November 


Stanislaus County 




5h 


1 


June to September 


Merced County 




kS 


1 


July to September 


Madera County 




27 


1 


July 


Fresno County 




63 


1 


July 


Tulare County 




11 


1 


August and September 


Kern County 




U 


1 


July and August 



LAHONTAN REGION (No. 6) 

Lower Mojave River Valley, 
Bars tow to Yermo (6-UO) 

COLORADO RIVER BASIN REGION (No. 7) 
Coachella Valley (7-21) 



lli 



12 



SANTA ANA REGION (No. 8) 

East Coastal Plain Pressure Area (8-1.01) 28 

Chino Basin (8-2.01) 8 

Bunker Hill Basin (8-2.06) 9 

SAN DIEGO REGION (No. 9) 

San Luis Key Valley, Mission Basin (9-7.01)l3 

El Cajon Valley (9-l6) 10 

Tia Juana Valley Basin (9-19) 13 



2 
2 
2 



2 
2 
2 



May and October 



May and October 



May and September 
July and December 
March and October 



March and October 
June and October 
June and November 



A-2 











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E-4 



A-2U 



APPENDIX B 
WELL DATA 

Page 

Well Numbering System B-1 

Well Data B-i? 



Well Numbering System 

Wells selected for inclusion in the ground water quality monitoring 
network are assigned numbers by township, range and section, based i;5)on their 
location. The numbering system is the same as that utilized by the United 
States Geological Survey. Under this system each section is divided into 
hO-acre plots, which are lettered as follows: 



D 


C 


B 


A 


E 


F 


G 


H 


M 


L 


K 


J 


N 


P 


Q 


R 



Wells are numbered within each of these UO-acre plots according to 
the order in which they are located. For example, a well having a number 
3N/6E-2iiA2, MDB&M, is located in Township 3 North, Range 6 East, and in Section 
2ii, Mount Diablo Base and Meridian. It is further identified as the second 
well located in the IiO-acre plot lettered A. Analyses of water samples reported 
herein are from wells located throughout the State; therefore, they are refer- 
enced to Humboldt Base and Meridian, San Bernardino Base and Meridian, as well 
as the Mount Diablo Base and Meridian. The appropriate reference grid is indi- 
cated in appendixes B and C in the column headed "State Well Number and Other 
Nxmber . " 



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APPENDIX C 
WATER QUALirr 

Page 

Laboratory Methods and Procedures C-1 

Water Quality Criteria C-3 

Criteria for Drinking Water C-3 

Criteria for Irrigation Water C-6 

Criteria for Industrial Uses C-7 

Analyses of Ground Water, 1958 C-10 



Laboratory Methods and Procedures 

Analytical methods used in determination of various constituents 
reported in the following tables conform, in general, to those presented in 
•'Standard Methods for the Examination of Water and Sewage," 10th Edition, 
1955, a joint p\±>lication of the American Public Health Association, the American 
Water Works Association, and the Federation of Sewage and Industrial Wastes 
Associations. For certain specific analyses, the methods described in "Methods 
of Water Analyses," 1956, a United States Geological Siorvey manual now in 
preparation, have been used. 

Laboratory analyses of the water samples are performed by the Water 
Quality Branch of the United States Geological Survey, and by the Department 
of Water Resources laboratories located in Sacramento, San Bernardino, and 
Riverside, or by the Terminal Testing Laboratories, Incorporated, located in 
Los Angeles, as indicated in the right hand column of the tables. 

The following tabulation indicates the tests made and the constit- 
uents usually analyzed in the ground water quality monitoring program. 



C-1 







: Anal 


y s 1 s 


Constituent 


: Standard 


: Partial 






: mineral 


: mineral 


Specific conductance 


X 


X 


pH 




X 


X 


Total dissolved 


solids 


X 




Percent sodium 




X 




Hardness 




X 


X 


Temperature 




X 


X 


Calcium 




X 




Magnesium 




X 




Sodium 




X 


X 


Potassium 




X 




Carbonate 




X 




Bicarbonate 




X 




Sulfate 




X 




Chloride 




X 


X 


Nitrate 




X 




Fluoride 




-: X 




Boron 




X 


X 


Silica 




X 





C-2 



Water Quality Criteria 

Presented herein are general criteria and limiting values presently- 
used by the Department of Water Resources in evaluating and classifying water 
quality. These values should be considered only as guides and indicators and 
not as absolute limitations. 

Criteria for Drinking Water 

Water that is used for drinking and culinary purposes must be clear, 
colorless, odorless, pleasant to the taste, and must not endanger the lives 
or health of human beings. These general requirements pertain to the water 
as it is finally delivered to the consumer; prior treatment may be necessary 
in order to comply with these requirements. 

Chapter 7 of the California Health and Safety Code contains laws 
and standards relating to domestic water supply. Section 1;010.5 of this code 
refers to the drinking water standards promulgated by the United States Public 
Health Service for water used on interstate carriers. These criteria have 
been adopted by the State of California. They are set forth in detail in 
United States Public Health Report, Volume 61, No. 11, March 15, 19ii6. 

According to Section ii.2 of the above-named report, chemical sub- 
stances in drinking water supplies, either natural or treated, should not 
exceed the concentrations shown in Table C-1. 



C-3 



TABLE C-1 

LmiTING CONCENTRATIONS OF 
MINERAL CONSTITUENTS IN EKDIKING WATER 

United States Public Health Service 
Drinking Water Standards, 19U6 



Constituent 



ppra 



Mandatory 

Fluoride (F) 

Lead (Pb) 

Selenium (Se) 

Hexavalent chromium (Cr ) 

Arsenic (As) 
Nonmandatory but Recommended Values 

Iron (Fe)and manganese (Mn) together 

Magnesium (Mg) 

Chloride (CI) 

Sulfate (SOi^) 

Copper (Cu) 

Zinc (Zn) 

Phenolic compounds in terms of phenol 

Dissolved solids, desirable 

Dissolved solids, permitted 



1.5 

0.1 

0.05 
0.05 
0.05 

0.3 

125 
250 
250 
3.0 

15 

0.001 

500 

1,000 



Interim standards for certain mineral constituents have recently 
been adopted by the California State Board of Public Health. Based on these 
standards, temporary permits may be issued for drinking water supplies failing 
to meet the United States Public Health Service Drinking Water Standards, pro- 
vided the mineral constituents in the following table are not exceeded. 



C-k 



UPPER LIMITS OF TOTAL SOLIDS AND SELECTED MINERALS IN 
DRINKING WATER AS IELI7ERED TO THE COKSOMER 

Permit Temporary permit 
in ppw in ppn 

Total solids 500 (1,000)* 1,500 

Sulfates (SOk) 250 ( 500 )♦ 600 

Chlorides (Cl) 250 ( 500)» 600 

Magnesium (Mg) 125 150 



♦ Numbers in parentheses are maximum permissible, 
to be used only where no other more suitable 
waters are available in sufficient quantity for 
use in the system. 

The California State Board of Public Health recently has defined the 

following maximum safe amoTxnts of fluoride in drinking water in relation to 

mean annual tocgperatiire : 

Mean annual Maximum mean monthly 
temperature Fluoride ion concentration 
in °F in ppa 

50 1.5 

60 1.0 

70 - above 0.7 

Other organic or mineral substances may be limited in concentration 
if their presence in water renders it hazardous as determined by state or local 
health authorities. The monitoring program reported herein does not include 
bacterial examinations. 

The relationship of infant methemoglobineaaia (a reduction of oxygen 
content in the blood, constituting a form of asphyxia) to nitrates in the water 
s;:?)ply has led to limitation of nitrates in drinking water. The California State 
Department of Public Health has reconnended a tentative limit of 10 ppa nitrate 
nitrogen {hh ppm nitrates) for domestic waters. Waters containing higher con- 
centrations of nitrates may be considered to be of questionable quality for 
domestic and municipal \ise. 



c-5 



An additional factor with which users are concerned is the hardness 
of water. Hardness is principally due to calcium and magnesixan and is gen- 
erally evidenced to the consumer by inability to develop suds when using soap. 
In general domestic use, hardness can result in increased soap constmrption and 
excessive repairs to plumbing. The following classification of water accord- 
ing to hardness has been suggested by the United States Geological Survey: 

Range of hardness 

in ppm Relative classification 

0-55 Soft 

56 - 100 Slightly hard 

101 - 200 Moderately hard 

Greater than 200 Very hard 

Criteria for Irrigation Water 

The following criteria for mineral quality of irrigation water have 
been developed at the University of California at Davis and at the United 
States Department of Agricultxire Regional Salinity Laboratory at Riverside. 
Because of diverse climatological conditions and variations in crops and soils 
in California, only general limits of quality for irrigation waters can be sug- 
gested. The department uses the three broad classifications of irrigation waters 
listed in Table C-2. 



C-6 



TABLE C-2 

QUALITATIVE CLASSIFICATION OF IRRIGATION WATERS 



Chemical properties 



Class 1 



Class 2 



Class 3 



Excellent to good :Good to injiirioiis : Injurious to 

: ; unsatisfactory 

(Suitable for most : (Possibly harmful: (Harmful to 
plants under any : for some crops :most crops and 
conditions of soil : under certain : unsatisfactory 
and climate) : soil conditions) :f or all but the 
I :most tolerant) 



Total dissolved solids 

In ppn , 

In conductance, EC x 10 

Chloride ion concentration 



Less than 700 
Less than 1,000 



700 - 2,000 
1,000 - 3,000 



More than 2,000 
More than 3,000 



In milliequivalents 

per liter Less 
In ppm Less 


than 5 
than 175 


5 - 
175 - 


10 

350 


More than 10 
More than 350 


Sodium in percent of 

base constituents Less 


than 60 


60 - 


75 


More than 75 


Boron in ppm Less 


than 0.5 


0.5 - 


2.0 


More than 2.0 


Criteria for Industrial Uses 











Quality criteria for the diversified uses of water in industry range 
from -exacting requirements for make\^ water used in high pressure boilers to 
minimum requirements for water for washdown and ore quenching. 

Industrial use of water includes utilization for food processing. 
Except for certain canning operations, water used in food processing must at 
least conform to qxiality requirements for drinking water supplies. The require- 
ments of some food processing industries, however, are more stringent than 
those contained in the drinking water standards of the United States Public 
Health Service. 

Because of the large number of industrial uses of water with widely 
varied quality requirements, it is difficult to establish more than broad 



C-7 



criteria of quality. Therefore, these requirements are expressed, where pos- 
sible, for groups of related industries rather than for individual manufacturing 
or other plants. The general quality requirements of several single industries 
and for representative major groups of industrial uses are listed in Table C-3. 



C-8 



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C-100 



APPENDIX D 



RADIOASSAY OF GROUND WATER 



Page 
Radiological Criteria D-1 

Procedvire and Interpretation of Results for Water Pollution Radioassay. . D-1 
Radioassay of Ground Water D-5 



» 



I 



Radiological Criteria 

According to the International Commission on Radiological Protection , 
and tentatively conciirred with by the National Committee on Radiation Protection'^, 
if the RadixBn-226 and Radiim-228 activity in water is substantially less than 
10 wic/l, the maxirnvm permissible concentration of otherwise unidentified radio- 
nuclides in water for individuals in the population at large may be considered 
to be 100 \i^c/l. 

For the purposes of the environmental survey of ground water made 
for this report, it has been assximed that the total alpha activity is derived 
from Ra^^^ and Ra^^^. 

During the 1958 reporting year, the highest alpha activity observed 
was 6.33 mic/l. It is believed that the maximim permissible concentration of 
100 jinc/l, as recommended by the I.C.R.P., is applicable to all wells sampled 
in the ground water monitoring program during 1958. 

Procedure and Interpretation of Results 
For Water Pollution Radioassay 

I. Analytical Procedures, Ground Water 
1. Sample Preparation 

a. Samples are collected in one-half gallon jugs- hy the Department of 
Water Resources and delivered to the Radiological Laboratory of 
the California Disaster Office for radioassay. 



1 "Report on Decisions of the 1959 Meeting of the International Commission on 
Radiological Protection (ICRP)". Radiology , Vol. 7U, No. 1, January I960, 
pp. 116-119. 

2 Somatic Radiation Dose for the General Population, Ad Hoc Committee of the 
National Committee on Radiation Protection and Measurements. Science , 
Vol. 131, No. 3399, February 19, I960, pp. U82-U86. 



D-1 



b. Each sample is mixed by agitating the jiig, and one 250 ml aliquot 
is removed . 

c. The aliquot is placed in a 250 ml volumetric flask and one drop of 
aerosol solution added. The flask is inverted vd.th the mouth placed 
in a 2"x l/U" aluminum culture dish that has been treated with 
Desicote. The flask is si;^ported by a ring stand and the water 
level adjusted to the lip of the dish in a "chicken-feeder- type" 
arrangement. The dish rests on a hotplate regulated so that the 
specimen is taken to dryness at a temperature well below the 
boiling point to prevent spattering. 

d. The specimen is now ready to be measured for radioactivity. 
2. Counting Techniques 

a. A gross beta-gamma determination is made for each specimen. 

b. Beta-gamma activity is determined with an internal gas flow counter 
operating in the proportional region, using argon-methane mixture 
as a flow gas. Background determinations are made before the first 
specimen count each day, and subsequently after each four speci- 
men counts throughout the day. Determinations of counter effi- 
ciency are made with a reference standard (Thallium 20li). Each 
determination of specimen and background count rate is made for 

a total of l,02i^ counts. Average time required for each specimen 
count is from 30 to iiO minutes. 

II. Limitations of Methods Employed 
1. Sample Preparation 

A perfect sample for determination of radioactive content would be 
infinitely thin, and would contain all of the constituents of the ori- 
ginal material except the water. 



D-2 



In practice, those criteria are virtiially impossible to attain. Es- 
sentially, infinitely thin samples can be prepared only from water with 
low solid and dissolved salts contents. Some solid and dissolved mater- 
ials may be absorbed on the walls of vessels used in sample collection 
and preparation. Volitilization and losses from spattering during vol- 
ume reduction cannot be completely avoided. 

Thus, obviously, radioassay results are dependent upon sample prepara- 
tion techniques. 

Nature of the Radioactive Disintegration Process and the Measurement 
Thereof 

At least three factors make the exact determinations of low levels of 

radioactivity extremely difficult. These are: 

a. The random nature of the radioactive disintegration process limit- 
ing the accuracy of any determination because of statistical fluc- 
tuations inherent in the counting data. 

b. The low ratio of sample count to background count. Any detector 
of radioactivity always measures (in the absence of an active sam- 
ple) at a certain — and not always constant — level, which is termed 
the background radiation level. This is caused by cosmic radia- 
tion, traces of naturally occurring radioactive materials, and 
sometimes by "noise" characteristic of the electronic equipment 
used. In making determinations on samples in which the counting 
rate is only slightly higher than the background counting rate, 
inherent errors are relatively large. 

c. Self -absorption. Unless samples are essentially infinitely thin, 
alpha and low-energy beta radiation arising from the lower layers 
of the samples may not penetrate the upper layers, and therefore 
remain undetected. 



D-3 



CoiTections can be made for self-absorption when dealing with known 
radioisotopes. In cases where the contaminant is not identifiable, 
these corrections cannot, as a rule, be made. 
3. Calculations 

There are three values which can lead to errors in the reported results. 
These are: 

a. Geometric efficiency. This factor is determined using artificial 
standards. These are not prepared in the same manner as samples. 
Also, it is possible that the energy of radiations emanating from 
the two standards may be significantly different from the unknown. 
Both of these considerations make the factors used rather artificial, 
and somewhat in error. It is not possible to determine the magni- 
tude of this error, although it is probably not large in most cases. 

b. Errors in sample count. Reasons for this were discussed in sec- 
tions 1 and 2 above. 

c. Errors in confidence limits. Statistical computations made are 
based on the Gaussian approximation of the Poisson distribution 
law. At low count rates, this approximation is subject to error. 
The calculated confidence limits are based solely on statistical 
fluctuations caused by the random nature of the radioactive dis- 
integration process. It is assumed that counts produced by back- 
ground radiation and by electronic noise are also random. By taking 
every possible measure to reduce sources of error, it is possible 

to obtain a relatively accurate measure of these low levels. As 
activity levels increase from near background, the precision of 
measurement increases correspondingly. 



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